Supporting Your Child in Maths Calculation Methods.

Supporting Your Child in Maths

Calculation Methods

Methods of Addition• Children need to know their number bonds to 10 and 20.

+10

24 34

+2

36• Then progress onto recording with

partitioning:

• 76 + 47 = 76 + 40 + 7 = 116 + 7

= 123

• Always start with the larger number first

24 + 12 = 36

+40 +7

76 116 123

Methods of Addition (continued…)

166+ 129 15 (9+6) 80 (60 + 20) 200 (100 + 100) 295

40 + 70 = 110

7 + 6 = 13

123 or 40 + 7

70 + 6

110 + 13

47+76 13 (7+6)

110 (40+70)

123

47

+76

123 1

• An example using larger numbers e.g. 166 + 129

166

+129

295 1

Methods of Subtraction• Again, children need to know their number bonds to 10 and

20!

• Next step is to use number lines to COUNT UP eg 48 - 29

+10+1

29 30

+8

40 48

• Children will then continue this method, but without the help of the number line and using larger numbers e.g. 783-356

• 356 360 = + 4• 360 400 = + 40• 400 700 = + 300• 700 783 = + 83

427

Methods of Subtraction……..(continued)

• The next step is to begin recording vertically, using partitioning e.g. 81 – 57 =

81 = 80 + 1 = 70 + 11- 57 = 50 + 7 = 50 + 7

20 + 4 = 24

• This then leads to the standard written method and will involve larger numbers .

81 754- 57 - 236 24 518

147

Multiplication – Grid Method

47 x 8 = x 40 78 320 56 376

Estimating very important e.g. 50 x 8 = 400

37 x 46 =x 30 7

40 1200 280 14806 180 42 222

1702

Multiplying Decimals

4.7 x 8 = 37.6 x 40 71dp 8 320 56 37.6

Estimating very important e.g. 5 x 8 = 40

3.7 x 4.6 = 17.022dp x 30 7

40 1200 280 14806 180 42 222

17.02

This then leads to the short method

First using partitioning 84 ÷ 7 =

First we partition the 84 into a convenient multiple of 7 + the rest

84

70 + 14

10 + 2 = 12

This is probably the method that children struggle most with. This method as with multiplication enables pupils to understand how the numbers work together.

Short Division

176.5 7 7 176.5

271 8 8 271 033 r7

3

025.23 1

Your turn to explore!

Visit as many tables to see how the written methods work and used throughout school

Feel free to ask children questions

Questions?

If you have any questions we will do our best to answer them.

How to help at home…

Parents can help by:

Assisting with homework; Playing maths games, such as snakes and ladders,

Connect 4, Guess Who, Monopoly or pairs. Playing on maths websites with them. Allowing children to pay in shops, weigh out fruit

when shopping, or bake cakes at home. Practical experiences and fun activities remain the

best ways for children to learn maths.

A big “Thank you” for attending

All posters and booklets shared today will be available to download from the school’s website:

http://www.northfieldhouse.leicester.sch.uk1. under curriculum2. maths section3. parent booklets