1. Objective: Subtract one, two or three-digit numbers by counting back. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1

2. Counting back to subtract numbers looks like this: 126 120 -6 < 9096 102 108114 < << < < -6

3. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Let’s have a go together… 230 223 -7 < 188195 202 209216 < << < < -7

4. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Write 500 at the top of a sheet of paper. Subtract 6 and write the new number underneath. Keep subtracting 6… How low can you go in 2 minutes?!

5. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Counting back to subtract a 2-digit number: 988 - 46 = 988 942 -6 < 942 -40 < 948

6. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Counting back to subtract a 3-digit number: 645 – 201 = 645 -200 444 < < 445

7. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Counting back to subtract a 3-digit number: 475 – 199 = 475 -200 +1 276 < < 275 276

8. © Hamilton Trust Stepping Up Term 3 Week 3 Day 1 Choose one to check with addition. It’s drill time again… Aim to be a subtraction sergeant! 431 - 7 431 - 27 736 - 420 556 - 70 302 - 8 303 - 52 304 - 198 731 - 202 517 - 298 571 - 53 924 - 299 768 - 370