61 + 457800 – 5600 5735 + 36575735 + 3990 83 – 685002 – 4996 538 - 295267 + 267 2.5 + 2.75.1 -...
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Transcript of 61 + 457800 – 5600 5735 + 36575735 + 3990 83 – 685002 – 4996 538 - 295267 + 267 2.5 + 2.75.1 -...
61 + 45 7800 – 5600
5735 + 3657 5735 + 3990
83 – 68 5002 – 4996
538 - 295 267 + 267
2.5 + 2.7 5.1 - 2.78
How do you add and subtract?
76 + 47 =
76
Addition
11676
+ 40
123
+ 7
86
+10
96
+10
106
+10
116
+10
123
+7
Addition
Moving on to…
67 + 56 = 60 + 50 = 110 7 + 6 = 11 121
358 + 473 =
Addition
358
+ 473
700120
11
831
358
+ 473
83111
Subtraction – KS1
Imran has 43 conkers; he gives 24 away to his friends. How many does he have left?
43 – 24 =
4333
-10
23
-10
20
-3-1
19
19 conkers
Subtraction
Sam has saved 93p, Amy has 55p. How much more money does Sam have than Amy?
93 – 55 =
55 60
+5
93
+3
90
+30
38p more
Subtraction
8.23 – 4.55 =
3.68
8.23
8.00
5.00
4.55
+0.23
+3+0.45
Subtraction
A sports stadium holds 9010 spectators. 5643 people attend a football match. How many empty seats are there?
5643 5700 9010
+ 57 +300 +3010
3367 empty seats
6000
3010
300
57
3367
57 x 2 78 ÷ 2
43 x 50 742 ÷ 2
36 x 25 700 ÷ 4
18 x 15 65.5 10
8 x 19 17 ÷ 5
34 x 7
How do you multiply and divide?
Multiplication
47 x 8 = x 40 78 320 56 376
37 x 46 =x 30 7
40 1200 280 14806 180 42 222
1702
……… leading to algebra
x a b
a a2 ab a
2 + ab
b ab b2
ab + b2
a2 + 2ab + b
2
(a + b)2 = (a + b) x (a + b)
(a + b)2 = a
2 + 2ab + b
2
3 x 3 = 94 x 5 = 20
5 x 15 = 75 7 x 5 = 35
Division
375 43 43 375
47 8 8 47
…or ‘chunking’
18 ÷ 3 = 6
We look carefully at the divisor and jump to the target number on a number line. Then count how many jumps.
+3 +3 +3 +3 +3 +3 ____
0 3 6 9 12 15 18
Moving on to…
78 ÷ 5 = 15 r 3
78
50 25 r3
5 x 10 5 x 5
How can you help?
Talk about how you do maths
Give praise and encouragement
Be positive
Ask your child to explain
Make sure maths is fun!
Use school
methods