1. Welcome To Subtraction Wednesday 5 th October 2016 If you can dream it, you can do it!

2. Lower School Methods Number lines are used to show jumps as they count back in Year 1.. 11 – 7 = 4 0 1 2 3 4 5 6 7 8 9 10 11

3. Lower School Methods They also use number lines to work out difference by counting on. The difference between 11 and 7 = 4 0 1 2 3 4 5 6 7 8 9 10 11

4. Practical Resources Bead Strings help children to physically move beads along the bar.

5. In Year 2 children use number lines to work out a small difference by counting up. 42 – 39 = 3 +1 +2 39 40 42 Try this with a bead string 63 - 59

6. In Year 2 children use known number facts and place value to subtract. 37 – 12 = 25 -2 -10 25 27 37 Try: 67 - 16

7. In Year 3 children continue to work out difference for numbers that are close together. Counting on is easier! Children work out the difference by counting on using a number line. 102 – 97 Work out 104 – 95 counting on with a number line.

8. Children also learn to answer more complex subtraction questions. 84 – 56 = 28 +4 +20 +4 56 60 80 84

9. In Year 3 children use formal methods for subtraction 8 7 4 - 5 2 3 3 5 1 As well as subtractions that involve borrowing. We use dienes to help the children understand. 472 – 239 =

10. In Year 4 children go on to decimals on a number line. 6.1 – 0.4 = 5.7 -0.3 -0.1 5.7 6.0 6.1

11. Children continue to use number lines in Year 4, as well as formal subtraction Formal subtraction with at least four digits. 6467 – 2684 = 3783

12. Year 5 and 6 Formal subtraction: 2932 – 1457 = 1457 Try this one: 2963 – 1279 =