1. Help your child with calculation strategies.

2. This is the way we do it! “They didn’t do it like that in my day!”

3. Do your children ask for help with their numeracy homework? Do they start talking in a foreign language, using words you have never heard of? If so, you may feel you need some translation. This session today is designed to explain some of the methods used to teach calculation.

4. Which is more important? Mental calculation? Written calculation? This will depend on the size of the numbers involved and the individual child. When faced with a calculation, no matter how large or difficult the numbers may appear to be, all children should ask themselves the following:

5. the? Can I do this in my head? I can’t do all of it in my head, what do I need to write down in order to help me calculate the answer? Do I know the approximate size of the answer? Will the written method I know be helpful?

6. Some of the methods we use in school are:  Column addition  Number line subtraction  Grid method multiplication  Chunking for division

7. ADDITION Number line 42 + 36 = 78 + 30 +6 42 72 = 78 Add tens, then units

8. 67 + 32 = 99 60+30 7+2 (90) + (9) = 99 Partitioning (upside down mountains )

9. Column addition 32 126 + 45 + 57 70 (30 + 40) 100 (100 + 0) 7 ( 2 + 5) 70 ( 20 + 50) 7 7 13 ( 6 + 7) 183 Brackets need not be used once your child is confident in this method.

10. Column addition (carrying under the line) 438 £ 1.67 + 284 +£ 2.45 722 £ 4.12 1 1 1 1 Extend to decimals making sure the decimal points line up under each other

11. Subtraction Number line : Counting on 48 - 36 = 12 + 4 +8 4 + 8 = 12 36 40 48

12. 67 - 32 = 35 60-30 7-2 (30) + (5) = 35 Subtraction Partitioning (upside down mountains )

13. The “minus method” 436 - 255 - 200 (400 – 200) - 20 (30 – 50) + 1 (6 – 5) 181 (200 – 20 + 1)

14. Leading to Decomposition 4 1 5 2 -2 7 2 5

15. The number line is still used to help with problem solving when dealing with time. Albert is going to visit his aunt. His journey takes an hour and 45 minutes, he arrives at 4:15 pm, what time did he start his journey? -1hour -15minutes -30minutes 4:15 3:15 3pm 2:30pm

16. Multiplication In Year 3 children are used to using repeated addition: 5 x 3 = 15 +3 + 3 + 3 + 3 + 3 0 3 6 9 12 15

17. The grid method : 27 x 54 = 1458 Partition first into tens and units x 20 7 50 1000 350 4 80 28 1080 + 378 = 1458

18. Division Repeated addition is used on a number line 15 ÷ 5 = 3 + 5 +5 +5 = 15 0 5 10 15

19. Work on remainders is done with the number line. 17 ÷ 5 = 3 r 2 +5 +5 +5 +2 0 5 10 15

20. Chunking “Chunks” of the divisor are recorded and used in repeated addition 72 ÷ 5 = 14 rem 2 0 bank + 50 (10 x 5) 10 + 20 (4 x 5) 4 70 14 + 2 rem. 72

21. Compact division or short division is used when children have developed Level 5 skills and a secure understanding of place value. 9 3 9 2 5 6 5 6 3 4

22. Thank you for attending, we hope you’ve found it useful. Now please visit the experts to see how it’s done in practice!