Trinity St Stephen Maths Evening 27 th November 2013 Gareth Edwards.
Maths Evening Powerpoint - Preston Primary School€¦ · Maths Evening Powerpoint Maths is like...
Transcript of Maths Evening Powerpoint - Preston Primary School€¦ · Maths Evening Powerpoint Maths is like...
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Maths Evening Powerpoint
Maths is like true love, a simple idea
but can get complicated!
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This evening I will…
• Inform you how and why we teach the four operations (addition, subtraction, multiplication and division) at the Preston Primary so that you can help your child in their maths activities.
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Your child will learn…• How to add effectively.
Addition
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Use of the hundred square
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Use of place value cards
23 = 20 + 3
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Use of place value cards for addition.
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Rules for Expanded Column Addition
A few tips to help you out!
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Expanded column addition
135
+ 42
7 (5 + 2)
70 ( 30 + 40)
100 ( 100 + 0)
177
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Column addition using carrying
348 +
245
1
348 +
245
3
348 +
245
593
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Your child will learn…• How to subtract.
Subtraction
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Subtraction
• Children start by recording subtraction using calculations with pictures. This helps them to develop a mental picture of the number system in their head.
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Use of the hundred squareFind ten more and ten less than a given number
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SubtractionIn Key Stage 1 children then use number lines (counting on OR backwards) practically and written to solve calculations. Also known as finding the difference. Number lines are powerful images to help children develop mental methods for subtraction.
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In Key Stage1…
• We teach the children to ‘count on’ on a number line when there is a small difference between numbers.
• For example: 82 - 78
78 80 82
+2 +2
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In Key Stage 2 children:
•Again, use the number line to count up to the nearest 10 and count on.
45 – 16 =16 → 20 → 30 → 40 → 45 = 4 + 10 + 10 + 5 = 29
16 4520 30 40
4 10 10 5
Gradually you need less jumps.
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Pencil and paper calculations
The numbers on the top row are partitioned (split up into tens and ones) to make the subtraction possible.
.
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Subtraction – decomposition
Many parents learnt this method mechanically using words like ‘borrowing’
and ‘paying back’. We now know children need a solid foundation using
previous methods to understand this ‘code’.
5 3 3- 1 8 7
3 4 6
4 12 1
Can get ‘messy’ if performing
a calculation like 2004 – 997.
Mental methods are quicker!
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Your child will learn…• How to multiply.
Multiplication
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It’s all about Groups
Multiplication means
groups of e.g. 3 x 2 means 3 groups of 2
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Learn all tables by end of Year 5!
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Multiplying by 10
When you multiply by 10,
all the digits move 1
place to the left and a
0 is added. 2 3
20 30
200 300
2000 3000
X 10
X 10
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Multiplying by partitioning
45 x 6
40 x 6 =240
5x 6=30
240+30=270
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This moves on to the grid method.
23 x 5 = ?
Partition the number larger number to make it easier for us to work out the answer.
23 = 20 + 3
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Now transfer all the information we have onto the grid.
x 5
20
3
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Firstly, times the digit on the top row by one of the numbers at the side. Write the answer on the grid.
Repeat for the other number.
x 5
20
3
100
15
Finally, add these two new numbers together.
= 115
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37 x 8630 7 x
80
6
560
180 42
2400
+2580 602
2580
602
31821
+
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Your child will learn…
• How to divide.
Division
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Early division begins with sharing in practical activities.
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Linking Multiplication
and Division
4 x 3 = 12
12 ÷ 3 = 4
3 x 4 = 12
12 ÷ 4 = 3
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20 ÷ 4 =
Children need to recognise that it can mean
20 shared by 4
How many lots of 4 in 20?
Link to multiplication facts
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Using a empty number line to divide
56 ÷ 4 =
56 ÷ 4 = 14
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Bus stop method
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• Try to use the 4 operations effectively in a range of real life situations (problem solving). Make maths real and fun for your children. Enjoy!
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Thank you for reading
• Recommended reading:
Maths for Mums and Dads
by Rob Eastaway and Mike Askew
• Should you have any questions or queries, please get in touch with Mrs Brown,
• Numeracy Co-ordinator.