1. © Hamilton Trust Keeping Up Term 1 Week 3 Day 3 Objectives: Subtract two-digit numbers from two-digit numbers and from numbers between 100 and 200 by counting back or by counting up Choose when to use each strategy

2. © Hamilton Trust Keeping Up Term 1 Week 3 Day 3 Work in pairs Will you count up or count back? Discuss with a partner how you will do each subtraction. 76 – 31 71 – 36 84 – 20 84 – 19 125 – 41 118 – 54

3. © Hamilton Trust Keeping Up Term 1 Week 3 Day 3 Use ‘counting back’ to solve these subtractions. 75 – 41 75 – 29 94 – 41 94 – 29 116 – 41 116 – 29 127 – 41 127 - 29

4. © Hamilton Trust Keeping Up Term 1 Week 3 Day 3 Would you use ‘counting up’ or ‘counting back’ to solve these subtractions? 58 – 27 58 – 22 95 – 39 138 – 75 143 – 22 110 – 19

5. © Hamilton Trust Keeping Up Term 1 Week 3 Day 3 8 20 1 4 5 3 9 6 7 Work in pairs. Choose two card numbers each. Use these to create a 2-digit number. Write it down. For example, if you choose 4 and 7 you could make 47 or 74. Look at your two numbers and each subtract the smaller from the larger. Record your calculation. Check your answers together – do you agree? Repeat this five times.