 # Supporting Your Child in Maths Calculation Methods.

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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 76116123

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 2930 +8 4048 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 700783 = + 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 14 7

Multiplication – Grid Method 47 x 8 = x 407 8 32056376 Estimating very important e.g. 50 x 8 = 400 37 x 46 = x 30 7 40 1200 280 1480 6 180 42 222 1702

Multiplying Decimals 4.7 x 8 = 37.6 x 407 1dp8 3205637.6 Estimating very important e.g. 5 x 8 = 40 3.7 x 4.6 = 17.02 2dp x 30 7 40 1200 280 1480 6 180 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 3 025.2 31

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.uk 1. under curriculum 2. maths section 3. parent booklets