Back to menu - Rickleton Primary School Calculation Policy + ÷ x Quit Multiplication...
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Transcript of Back to menu - Rickleton Primary School Calculation Policy + ÷ x Quit Multiplication...
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-RRickletonickleton P Primaryrimary
SSchoolchoolCCalculationalculation P Policyolicy
+÷x
Quit
Multiplication
Addition Subtraction
Division
*Only click when prompted to ensure all steps are seen.
Select an operation to become a
maths wizard!
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menu
Select a stage!Select a stage!
⋆ Addition - Stage 1
⋆ Addition - Stage 2
⋆ Addition - Stage 3
⋆ Addition - Stage 4
Zap a stage
!
Pre-Written Methods
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menu
Select a stage!Select a stage!
⋆ Subtraction - Stage 1
⋆ Subtraction - Stage 2
⋆ Subtraction - Stage 3
⋆ Subtraction - Stage 4
Zap a stage
!
Pre-Written Methods
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Select a stage!Select a stage!
⋆ Multiplication - Stage 1
⋆ Multiplication - Stage 2
⋆ Multiplication - Stage 3
⋆ Multiplication - Stage 4
Zap a stage
!
Pre-Written Methods
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Select a stage!Select a stage!⋆ Division - Stage 1
⋆ Division - Stage 2
⋆ Division - Stage 3
⋆ Division - Stage 4
Zap a stage
!
Pre-Written Methods
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Begin by drawing a number line starting with the biggest number
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 1 ~ 1
22 + 33 =
______________________________
Next
33
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++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 1 ~ 2
22 + 33 =
______________________________
Next
33
+10 +10
43 53
Add 2 tens first
T
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++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 1 ~ 3
22 + 33 =
______________________________33
+10 +10 +1 +1
43 555453
Then add 2 unitsU
So 22 + 33 is 55
55
Select a
stage.
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menu
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 2 ~ 1
36 + 43 = Start by partitioning the tens and the units.
TU TU
30 + 40
6 + 3
Next
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36 + 43 =
30 + 40 = 70 6 + 3 = 9
Add the tens together and then the units.
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 2 ~ 2
70 + 9 = 79
So 36 + 43 is 79
Select a
stage.
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47 + 76 =
Next
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ Stage 3 ~ 1
Write the numbers so that the Tens and the Units are in line.
T U
47
+ 76
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47
+ 76
Start by adding the the units.
7 + 6 =
U
13
Next
Stage 3 ~ 2
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
47 + 76 =
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47
+ 76
Next
Stage 3 ~ 3
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
110
Then add the tens.
40 + 70 =
T
13
47 + 76 =
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110
47
+ 76
Stage 3 ~ 4
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
13
123
Now add these together
110 + 13 = +
So 47 + 76 is 123
47 + 76 =
HTU + HTU
Select a
stage.
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++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++ HTU + HTU
247 + 176 =
110
247
+ 176
13
423
Set out as before. Add the units and tens as before and record.
The extra step, add the hundreds together
200 + 100 = 300
Then add the numbers.
+300
So 247 + 176 is 423
Select a
stage.
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47 + 76 =
Next
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
Stage 4 ~ 1
47
+ 76Write the numbers so that the Tens and the Units are in line.
T U
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47 + 36 =
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
Stage 4 ~ 2
47
+ 36
Now add the units
7 + 6 = 13U
3 units go in the units column33 units go in the units column
1
7 + 6 = 13
Next
Exchange 10 units for 1 ten. This goes under in the tens column
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47 + 36 =
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
Stage 4 ~ 3
3
1
Now add the tens
40 + 30 = 70T
Remember there is one ten here to add too. 7 tens + 1 ten = 8 tens
You need to put the ten digit in the tens column
8
47
+ 36
So 47 + 36 is 83
Select a
stage.
See HTU + HTU
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147 + 186 =
++ AdditionAddition ~~ Watch and Watch and
Learn!Learn! ++
HTU + HTU
1
3
147
+ 186
So 147 + 186 is 333
Select a
stage.
Carry any units over 9,
any tens over 90.
Remember to add the carry!
7 + 6 = 13 carry the ten
40 + 80 + 10 = 130 carry the hundred
100 + 100 + 100 = 300
133
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-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 1 ~ 1
______________________________-10
473727
47 - 23 =
-10
So 47 – 23 = 24
Take away in steps of 10 first as this is easier. 23 = 2 tens.
-1-1-1
262524
Then take away in jumps of 1. 3 units equal 3 jumps.
Place the largest number at the end of the line.
24
Select a
stage.
See HTU-HTU
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-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--HTU-HTU
______________________________-100
347247227
347 - 123 =
-20
So 347 – 123 = 224
Take away in steps of 100 first as this is easier. 123 = 100.
-3
224
Then take away the tens. Then the units.
Place the largest number at the end of the line.
224
Select a
stage.
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-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 2 ~ 1 taking away by counting up
74 - 35 =
Write the numbers so that the Tens and the Units are in line.
T U
74
- 35
Start at 35 add 5 to make 40. Then add suitable numbers to reach 74.
+5 (40)
+30 (70)
+4 (74)Add the numbers together.
39
So 74 - 35 is 39
Select a
stage.
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563 - 241 =
Next
-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 3 ~ 1
500 + 60 + 3- 200 + 40 + 1
Repeat with 241
Partition 563 into hundreds, tens and units.
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- 200 + 40 + 1300
Next, subtract the tens
60 – 40 = 20
563 - 241 =
Next
-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 3 ~ 2
500 + 60 + 3- 200 + 40 + 1
Start with the units
3 – 1 = 2
2
UH T
20Next, subtract the hundreds
500 – 200 = 300
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-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 3 ~ 3
Add the answers together
300 + 20 + 2 = 322- 200 + 40 + 2300
563 - 241 =
500 + 60 + 3- 200 + 40 + 1
220 = 322
So 563 - 241 = 322Select
a stage.
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Next
-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 4 ~ 1 Decomposition 137 - 85 =
Write the numbers so that they are in place value position.
137
- 85
H T U
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Next
-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 4 ~ 2
137 - 85 = 1 3 7
- 8 5
Subtract the units first. 7 – 5 =
And write under the units.
2
The tens can’t be subtracted as 30 – 80 = - 50
Borrow 1 hundred from the hundred column.
01
Cross out the hundred and leave a 0 above. The 100 is put in the tens as a 1.
The tens column now has 130 in it and the hundred has 0.
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-- SubtractionSubtraction ~~ Watch and Learn!Watch and Learn!
--Stage 4 ~ 3
So 137 - 85 = 52
Now solve 130 – 80 and write the answer.
There are 0 hundreds to subtract.
1 3 7
- 8 5
2
01
5
137 - 85 =
Select a
stage.
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 1 ~ 1
= 4 x 5
= 10 x 5
14 x 5 =
Next
Partition the 14 into 2 parts, tens and units.
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 1 ~ 2
So 14 x 5 = 70
4 x 5
10 x 5
14 x 5 =
= 50
= 20
Now add 50 + 20 and write the answer.
Select a
stage.
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Draw a box two across and one down because you are multiplying a 2 digit number by a 1 digit number.
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx
Stage 2 ~ 1
16 x 4 =
Next
10 6
4
Partition 16 into 1 ten and 6 units
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The answer to 10 x 4 goes here.
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx
Stage 2 ~ 216 x 4 =
10 6
4
The answer to 4 x 6 goes here.
x
40 24
Now add these answers together. 40 + 24 =
So 16 x 4 = 64
See TU x TU See HTU x U
Select a
stage.
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Partition 56 into 5 tens and 6 units
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx TU x TU ~ 1
56 x 27 =
Next
20 7
6
50
Partition 27 into 2 tens and 7 units
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The answer to 50 x 20 goes here.
The answer to 6 x 20 goes here.
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx TU x TU ~ 2
56 x 27 = 20 7
6
50
The answer to 50 x 7 goes here.
1000
350
The answer to 6 x 7 goes here
Next
x
120 42
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx TU x TU ~ 3
56 x 27 = 20 7
6
50 Add these four numbers together.
1000 + 350 + 120 + 42 =
Children can use the addition methods to help them add.
1000
350
x
120 42
So 56 x 27 = 1512
See HTU x U
Select a
stage.
Back to
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx HTU x U ~ 1126 x 4 =
Next
100 20
4
Partition 126 into 1 hundred,
2 tens and 6 units
6
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx HTU x U ~ 2126 x 4 =
Next
100 20
4
Partition 126 into 100,
20 and 6
6
400 80 24The answer to 4 x 100 goes here.
The answer to 20 x 4 goes here
The answer to 6 x 4 goes here.
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xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xx HTU x U ~ 3126 x 4 =
100 20
4
6
400 80 24
Add 400 + 80 + 24
So 126 x 4 = 504
See TU x TU
Select a
stage.
Back to
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38 x 7 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 3 ~ 1
38
x 7Set the sum out like this so that the numbers are in the correct columns.
T U
Next
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menu
38 x 7 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 3 ~ 2
38
x 7
56
210
Multiply the tens by 7
7 x 30 = 210
Multiply the units by 7
7 x 8 = 56
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38 x 7 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 3 ~ 3
38
x 7
56210266
Now add these two answers together. 56 + 210.
So 38 x 7 = 266
See TU x TU
Select a
stage.
Back to
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15 x 24 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU ~ 1
15
x 24Set the sum out like this so that the numbers are in the correct columns.
T U
Next
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15 x 24 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU ~ 2
X 24
20
40
Multiply by the units
4 x 5 = 20 and
4 x 10 = 40
15
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15 x 24 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU ~ 3
X 24
2040
Multiply by tens
20 x 5 = 100 and
20 x 10 = 200
15
100200
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15 x 24 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU ~ 4
Now add these numbers together.
So 15 x 24 = 360
X 24
2040
15
100200360
Select a
stage.
Back to
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38 x 7 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 4 ~ 1
38
x 7Set the sum out like this so that the numbers are in the correct columns.
T U
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38 x 7 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 4 ~ 2
38
x 7
Now multiply 7 x 8 = 56 and write the units and carry the tens underneath.
6
5
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38 x 7 =
Next
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 4 ~ 3
38
x 7
Now multiply 7 x 30= 210 and add the 5 tens to the 10 and write this and carry the hundreds underneath.
6
5
6
2
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38 x 7 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxStage 4 ~ 4
38
x 7
Now put the hundreds into the answer
6
5
6
2
2
So 38 x 7 = 266Select
a stage.
See TUxTU
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38 x 27 =
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU – Magic 0
38
x 27
65
6
0
2
Set out as shown.
First multiply 7 x 8 = 56.
Carry the 5 tens and record the 6.
Then 7 x 3 = 21 plus the 5 = 26 (record)
Next place the magic 0 into the units column.
Now 2 x 8 = 16
Carry the 1 and record the 6.
Now 2 x 3 = 6 and add to the 1 carry
Nb. Each number is considered as a unit in this calculation to make it easier.
eg. 30 is 3 and 20 is 2.
167
Next
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38 x 27 = 38
x 27
65
6
0
2
Nb. Each number is considered as a unit in this calculation to make it easier.
eg. 30 is 3 and 20 is 2.
167
xx MultiplicationMultiplication ~~ Watch and Watch and
Learn!Learn! xxTU x TU – Magic 0
Finally add 266 and 760.
6201Select a
stage.
So 38 x 27 = 1026
11
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Stage 1 ~ 1 Repeated subtraction
24 ÷ 3 =
0
Jump back in 3’s (the divider) until no more can be taken.
2418 21
÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Write the number to divide at the end of a number line.
1512963
-3
Now count the number of jumps. 8 jumps
So 24 ÷ 3 = 8
-3-3-3-3-3-3-3
Select a
stage.
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63 ÷ 3 =
Next
÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷
3 63
Stage 2 ~ 1 - chunkingTwo ways to set out
or
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Children will look for chunks. First take chunks (multiples) of 10,then 5 and then single units until you have the divided number - 63
63 ÷ 3 =
÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷
3 6330 + 30 + 3 = 63 so we have taken all chunks possible.
Stage 2 ~ 2
30 (3 x 10)
30 (3 x 10)
3 (3 x 1) Add the chunks.
10 + 10 + 1 = 21
So 63 ÷ 3 = 21
2121
Select a
stage.
Back to
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÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Stage 3 ~ 1 – Long division
Next
So 198 ÷ 6 = 33
6 198
Children will look for chunks. Try to use multiples of 10, 20, 30 etc to remove the largest possible multiple of 6.(6 x 30)- 180
Record the chunk in brackets and put the answer underneath the original number. Subtract the chunk from the divided number. Then look for more chunks.
18
- 18 (6 x 3)
0
Once all chunks have been taken and 0 or a remainder is left, show the answer at the top by adding the chunks. 30 + 3 = 33
33
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÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Stage 3 ~ 2 With remaindersHTU ÷ TU
So 560 ÷ 24 = 23 r 8
24 560
Children will look for chunks. Try to use multiples of 10, 20, 30 etc to remove the largest possible multiple of 24.(24 x
20)- 480
Record the chunk in brackets and put the answer underneath the original number. Subtract the chunk from the divided number. Then look for more chunks.
80
- 72 (24 x 3)
8
Once all chunks have been taken and 0 or a remainder is left, show the answer at the top by adding the chunks. There is not enough to make another 24 so there is a remainder of 8.20 + 3 = 23 r 8
23 r 8
Select a
stage.
Back to
menu
÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Stage 4 ~ 1 short division
3 8 1
Regard each digit on its own.Work from left to right.
•How many 3’s are in 8?
Mental Working
•2 with 2 remaining. •Record the 2 above the line. Then carry the remaining 2 over.
22
•Record the 2 next to the one making 21.
•How many 3’s in 21 = 7. Record above the 21.
7
So 81 ÷ 3 = 27
81 ÷ 3 =
Next
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÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Stage 4 ~ With remainders
12 2 2 4 Regard each digit on its own.Work from left to right.
•How many 12’s are in 2?
Mental Working
•0 with 2 remaining. •Record the 0 above the line. Then carry the remaining 2 over.
02
•Record the 2 next to the two making 22.
•How many 12’s in 22 = 1 – Record above the 22.
1
So 224 ÷ 12 = 18 r8
224 ÷ 12 =10
8 r 8
•Carry the 10 and record how many 12’s in 104.•Record the 8 and remember the 8 remaining.
Next
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÷÷ DivisionDivision ~~ Watch and Watch and
Learn!Learn! ÷÷Stage 4 ~ With decimals
4 2 5 0
•How many 4’s are in 2?
Mental Working
•0 with 2 remaining.
•Record the 0 above the line. Then carry the remaining 2 over making 25.
02
•How many 4’s in 25 = 6 with 1 remainder. Record above the 25.
6
So 250 ÷ 4 = 62.5
250 ÷ 4 =1
2
•Carry the 1 and record how many 4’s in 10 = 2 with 2 remaining.•Now add a decimal point and carry the 2 making 20.
Select a
stage.
. 0
. 52
•How many 4’s in 20 = 5. Record above
•Only record to a maximum of 2 decimal places.