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

2. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 Counting back to subtract numbers looks like this: 300 293 -7 < 258265 272 279286 < << < < -7

3. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 Write 523 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?!

4. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 Counting back to subtract a 2-digit number: 310 – 43 = 310 -40 -3 267 < < 270

5. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 Counting back to subtract a 3-digit number: 748 – 201 = 748 -200 547 < < 548

6. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 Counting back to subtract a 3-digit number: 835 – 199 = 835 -200 +1 636 < < 635 636

7. © Hamilton Trust Keeping Up Term 3 Week 3 Day 1 It’s drill time again… Aim to be a subtraction sergeant! 431 - 7 431 - 27 431 - 207 556 - 70 302 - 8 303 - 52 304 - 198 736 - 420 517 - 298 571 - 53 924 - 299 768 - 370