Addition and Subtraction Know addition and subtraction facts
Addition and Subtraction Know addition and subtraction facts Missing numbers Objectives Day 1 Know pairs to 10, and then to 7, 8 and 9. Day 2 Know pairs to 20. Day 3 Know pairs to 10 and 20, and write related addition and subtraction facts. © hamilton-trust. org. uk 1 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Starters Day 1 Pairs to 10 (pre-requisite skills) Day 2 Say one more or one less than any 2 -digit number (simmering skills) Day 3 Place value in 2 -digit numbers (simmering skills) © hamilton-trust. org. uk 2 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Starter Pairs to 10 © hamilton-trust. org. uk 3 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Starter Say one more or one less than any 2 -digit number © hamilton-trust. org. uk 4 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Starter Place value in 2 -digit numbers © hamilton-trust. org. uk 5 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Objectives Day 1 Know pairs to 10, and then to 7, 8 and 9. © hamilton-trust. org. uk 6 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Hang weights on the number balance, 6 on one side and 10 on the other. Where should I hang it? If I hang an extra weight on the left side it will balance. 6 + 4 = 10 © hamilton-trust. org. uk 7 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Hang weights: 6 on one side, and 9 and 1 on the other. How could we make it balance? What happens? 6 and 4 balance 9 and 1. © hamilton-trust. org. uk 6+ 4 =9+1 8 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Move the weight on 1 to 2. What can I do to the other side so it balances? What happens? 6 and 5 balance 9 and 2. © hamilton-trust. org. uk 6+ 5 =9+2 9 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Hang weights: 7 and 3 on one side, and 8 on the other. Where shall we hang a weight this time to balance? 7 and 3 balance 8 and 2. © hamilton-trust. org. uk 7+3=8+2 10 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Hang weights: 5 and 3 on one side, and 6 on the other. Where shall we hang a weight this time to balance? 5 and 3 balance 6 and 2. © hamilton-trust. org. uk 5+3=6+2 11 Year 2
Day 1: Know pairs to 10, and then to 7, 8 and 9. Hang weights: 7 and 1 on one side, and 4 on the other. Where shall we hang a weight this time to balance? 7 and 1 balance 4 and 4. © hamilton-trust. org. uk 7+1=4+4 12 Year 2
Challenge © hamilton-trust. org. uk 13 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Objectives Day 2 Know pairs to 20. © hamilton-trust. org. uk 14 Year 2
Day 2: Know pairs to 20. How many beads are there on each bar? © hamilton-trust. org. uk And altogether ? 15 Year 2
Day 2: Know pairs to 20. How many have I hidden? How do you know? © hamilton-trust. org. uk What colour are they? How many were on the bottom row? 15 + 5 = 20 16 What do you add to 5 to make 10? Year 2
Day 2: Know pairs to 20. How many have I hidden? How do you know? © hamilton-trust. org. uk What colour are they? How many were on the bottom row? 18 + 2 = 20 17 What do you add to 8 to make 10? Year 2
Day 2: Know pairs to 20. How many have I hidden? How do you know? © hamilton-trust. org. uk What colour are they? How many were on the bottom row? 16 + 4 = 20 18 What do you add to 6 to make 10? Year 2
Day 2: Know pairs to 20. How many have I hidden? How do you know? © hamilton-trust. org. uk What colour are they? How many were on the bottom row? 14 + 6 = 20 19 What do you add to 4 to make 10? Year 2
Day 2: Know pairs to 20. If we know 7 add 3 makes 10, what do we add to 17 to make 20? What do we add to 13 to make 20? How do you know? 13 + 7 = 20 17 + 3 = 20 © hamilton-trust. org. uk 20 Year 2
Challenge © hamilton-trust. org. uk 21 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Objectives Day 3 Know pairs to 10 and 20, and write related addition and subtraction facts. © hamilton-trust. org. uk 22 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. This picture shows that 6 and 4 cubes is the same amount as 10 cubes. 6 + 4 = 10 We could have the 4 cubes first and then the 6 cubes, and this would still give 10 cubes altogether! 4 + 6 = 10 © hamilton-trust. org. uk 23 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. If we took away the 4 cubes, how many cubes would be left? 10 – 4 = 6 What if we took away the 6 cubes instead? 10 – 6 = 4 © hamilton-trust. org. uk 24 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. We can write 4 number sentences to go with this one picture! 6 + 4 = 10 4 + 6 = 10 10 – 4 = 6 10 – 6 = 4 © hamilton-trust. org. uk 25 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. It can be time 10 consuming to draw all the cubes, so 6 just draw bars to we can represent the cubes. © hamilton-trust. org. uk 26 4 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. 10 5 5 With a partner, write an addition and a subtraction to go with this picture. 5 + 5 = 10 10 – 5 = 5 © hamilton-trust. org. uk 27 Year 2
Day 3: Know pairs to 10 and 20, and write related addition and subtraction facts. Let’s write number sentences to go with this picture. 20 16 4 16 + 4 = 20 4 + 16 = 20 20 – 4 = 16 20 – 16 = 4 © hamilton-trust. org. uk 28 Year 2
Pairs to 20 Sheet 2 Write the missing number in each bar model. 20 20 11 13 20 20 5 16 20 20 7 12 20 20 9 Challenge © hamilton-trust. org. uk 29 Year 2
Addition and Subtraction Know addition and subtraction facts Missing numbers Well Done! You’ve completed this unit. Objectives Day 1 Know pairs to 10, and then to 7, 8 and 9. Day 2 Know pairs to 20. Day 3 Know pairs to 10 and 20, and write related addition and subtraction facts. © hamilton-trust. org. uk 30 Year 2
Problem solving and reasoning questions Write the pairs of possible missing numbers. 11 20 ? ? How many different ways are there of writing numbers in the two boxes in this sentence? ☐ + = 10 What if the total of the two missing numbers = 9? Or = 8? You have 21 cards: 0 to 20. How many pairs of numbers can you create which make 20? Write these. Write the pair you cannot create. © hamilton-trust. org. uk 31 Year 2
Problem solving and reasoning: Answers Write the pairs of possible missing numbers. 11 20 ? ? The missing pair of numbers adds to 9… 5 + 4 (or 4 + 5); 6 + 3 (or 3 + 6); 7 + 2 (or 2 + 7); 8 + 1 (or 1 + 8); 9 + 0 (or 0 + 9). Errors may arise when children fail to recognise 9 as the difference between 20 and 11. For this, and the following questions, consider how systematically children have listed the possibilities and challenge them to do so if they have missed some of the answers. How many different ways are there of writing numbers in the two boxes in this sentence? ☐ + = 10 11 possibilities 10 + 0, 9 + 1, 8 + 2 … 1 + 9, 0 + 10 What if the total of the two missing numbers = 9? Or = 8? 10 possibilities if the total is 9; 9 possibilities if the total is 8. You have 21 cards: 0 to 20. How many pairs of numbers can you create which make 20? Write these. 10 pairs: 20 + 0, 19 + 1, 18 + 2, 17 + 3, 16 + 4, 15 + 5, 14 + 6, 13 + 7, 12 + 8, 11 + 9. Write the pair you cannot create. The missing pair is 10 + 10 (since there is only one 10 card). © hamilton-trust. org. uk 32 Year 2
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