2. Today we will be learning: to recognise and use patterns in subtraction to use patterns to solve further problems.

3. Mental Activity Practise counting back in tens from 100.

4. Now we are going to count back in tens starting from different numbers.

5. Start counting back from … 93758262126134

6. Count back in tens from 93. 938373635343 What do you notice about the last digit at each stage? 3323133 What about the tens digit?

7. Count four tens back from 75. 756555 How did you know when to stop? 4535

8. Main Activity Today we will be looking for patterns to help with subtraction calculations.

9. 12345678910 11121314151617181920 21222324252627282930 31323334353637383940 41424344454647484950 51525354555657585960 61626364656667686970 71727374757677787980 81828384858687888990 919293949596979899100 We can use a hundred grid to help us to count back. 29 – 6 =23

10. 12345678910 11121314151617181920 21222324252627282930 31323334353637383940 41424344454647484950 51525354555657585960 61626364656667686970 71727374757677787980 81828384858687888990 919293949596979899100 If we move up a square to start at 19 and count back 6, what is the answer? 29 – 6 =23 1319 – 6 = 39 – 6 = Can you see a pattern?

11. 12345678910 11121314151617181920 21222324252627282930 31323334353637383940 41424344454647484950 51525354555657585960 61626364656667686970 71727374757677787980 81828384858687888990 919293949596979899100 We are going to look at another pattern. 78 – 6 =72 78 – 16 =62 78 – 26 =52 78 – 36 =42 78 – 46 =32 78 – 56 =22 78 – 66 =12 78 – 76 =2