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Objectives: • Work out, very quickly, pairs of one-place decimal numbers with a total of 1, then 10; • Add pairs of one-place decimal numbers. © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 Quickly write down the pairs of numbers 0-10 that add to 10. Can you write them all in 1 minute? Now use the cards below to find pairs to make 1 Can you write them all in 1 minute? 0.1 0.2 0.8 Why is the same number on two cards? © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 Which decimal numbers together make 10? 7 0.4 2.6 3.0 10 Use a number line jotting to work out what goes with 4.3, 6.1, 5.8 and 8.9 to make 10. © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 Work in pairs. Repeat this activity five times. • Write five one-place decimal numbers secretly on your page. • Take turns to say a one-place decimal number less than 1 to your partner. For example say 0.6. • Does this go with any of their numbers to make a whole number? For example one of their numbers is 8.4, so yes! • They score the amount they need to add to their number to make 10. For example 8.4 + 1.6 = 10. Score 1.6. • Swap roles, with your partner saying a similar number to you. The winner is the player with the highest score after five goes. © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 We use pairs to 1 to add two decimal numbers. 4.6 + 2.7 0.3 0.4 4.6 2.0 5.0 5.3 7.3 Use a number line jotting to work out: 5.5 + 3.6 and 4.7 + 2.8 © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 Use pairs to 1 and a number line jotting to solve these calculations: 4.5 + 2.6 6.7 + 1.5 3.8 + 3.3 8.5 + 1.5 5.4 + 3.8 7.6 + 2.7 © Hamilton Trust Keeping Up Term 1 Week 7 Day 1 Fill in the missing numbers. 1. 4.6 + ☐ = 10 2. 7.2 + ☐ = 10 3. 4.5 + 5.5 = ☐ 4. 6.3 + 1.7 = ☐ 5. 5.4 + 2.6 = ☐ 6. 7.5 + 3.5 = ☐ 7. 6.7 + 3.3 = ☐ 8. 5.2 + ☐ = 10 9. 8.2 + ☐ = 10 10. 0.6 + ☐ = 1 11. 7.8 + 1.6 = ☐ 12. 4.4 + 3.6 = ☐ 13. 4.5 + 3.7 = ☐ 14. 9.2 + ☐ = 10 © Hamilton Trust Keeping Up Term 1 Week 7 Day 1