Addition and Subtraction Using facts and digit patterns

Addition and Subtraction Using facts and digit patterns Objectives Day 1 Y 2: Use number facts or place value to add and subtract. Y 3: Add 1 -digit numbers to 2 -digit numbers using number facts. Day 2 Y 2: Use number facts or place value to add and subtract. Y 3: Subtract 1 -digit numbers from 2 -digit numbers using number facts. Day 3 Y 2: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers. Y 3: Add several numbers less than 20. © hamilton-trust. org. uk 1 Year 2/3

Addition and Subtraction Using facts and digit patterns Short Mental Workouts Day 1 Pairs to 20 Day 2 Complements to multiples of 10 on a bead bar Day 3 Complements to multiples of 10 bingo game © hamilton-trust. org. uk 2 Year 2/3

Addition and Subtraction Using facts and digit patterns Short Mental Workout Pairs to 20 © hamilton-trust. org. uk 3 Year 2/3

Addition and Subtraction Using facts and digit patterns Short Mental Workout Complements to multiples of 10 on a bead bar © hamilton-trust. org. uk 4 Year 2/3

Addition and Subtraction Using facts and digit patterns Short Mental Workout Complements to multiples of 10 bingo game © hamilton-trust. org. uk 5 Year 2/3

Addition and Subtraction Using facts and digit patterns Objectives Day 1 Y 2: Use number facts or place value to add and subtract. Y 3: Add 1 -digit numbers to 2 -digit numbers using number facts. © hamilton-trust. org. uk 6 Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 5 add 2? What is 25 + 2? 35 + 2? 45 Weuse onlythe needed + 2? We can same to number know fact (5 one + 2)number to fact (5 + 2) to find What is 15 add help find all of those! 15 + 2. 2? © hamilton-trust. org. uk 7 Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 6 add 3? What is 26 + 3? 36 + 3? 76 We same only needed to + 3? We can use the know number fact (6 + 3) toone number fact (6 + 3) to find What is 16 help add find all of those! 16 + 3. 3? © hamilton-trust. org. uk 8 Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 4 add 4? We only needed to If 4 + 4 = 8 and 14 + 4 = know one number 18 what else do we know? fact (4 + 4) to find What is 14 add 14 + 4. 4? © hamilton-trust. org. uk 9 Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 5 take away 2? So what is 15 take away 2? © hamilton-trust. org. uk 10 If we know what 5 - 2 is, then we can use this fact to find 15 – 2. Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 7 take away 3? So what is 17 take away 3? © hamilton-trust. org. uk 11 If we know what 7 - 3 is, then we can use this fact to find 17 – 3. Year 2/3

Day 1: Use number facts or place value to add and subtract; Add 1 -digit numbers to 2 -digit numbers using number facts. What is 6 take away 4? So what is 16 take away 4? © hamilton-trust. org. uk 12 If we know what 6 - 4 is, then we can use this fact to find 16 – 4. Year 2/3

Challenge © hamilton-trust. org. uk 13 Year 2/3

Day 1: Add 1 -digit numbers to 2 -digit numbers using number facts. 15 25 35 Let’s use this bead bar to help us find 15 + 3 = 25 + 3 = 35 + 3 = © hamilton-trust. org. uk Now let’s try 25 + 3 and 35 + 3. Talk to your partner… How do you think this sequence will continue? 14 What would be 105 + 3? 125 + 3? Year 2/3

Day 1: Add 1 -digit numbers to 2 -digit numbers using number facts. 7 17 27 What do we need to add to 7 to make 10? What do we need to add to 17 to make 20? How do you think this sequence will continue? © hamilton-trust. org. uk What do we need to add to 27 to make 30? What if you started from 6, 16, 26…… How would you get to the next 10? 15 Year 2/3

Day 1: Add 1 -digit numbers to 2 -digit numbers using number facts. 17 What is 17 + 7? 27 How can we split the 7 to help? Talk to your partner – how can you add 7 to 27? © hamilton-trust. org. uk What do we need to add to 17 to make 20? How much of the 7 is left to add on to 20? 16 Year 2/3

Day 1: Add 1 -digit numbers to 2 -digit numbers using number facts. We can also use a number line to help. Let’s try 37 + 7 Who can draw the steps on the number line? Talk to your partner. How can you work out 58 + 7? Would you split 7 the same way? © hamilton-trust. org. uk Now let’s try 47 + 7. Who can draw the steps on the number line? 17 Year 2/3

Challenge © hamilton-trust. org. uk 18 Year 2/3

Addition and Subtraction Using facts and digit patterns Objectives Day 2 Y 2: Use number facts or place value to add and subtract. Y 3: Subtract 1 -digit numbers from 2 -digit numbers using number facts. © hamilton-trust. org. uk 19 Year 2/3

Day 2: Use number facts or place value to add and subtract; Subtract 1 -digit numbers from 2 -digit numbers using number facts. 35 + 3 27 – 7 27 – 5 30 + 5 56 + 3 42 + 4 99 – 9 How could you find 27 - 7? What would you use to help? How could you find 35 + 3? What would you use to help? Number facts Place value 35 + 3 27 – 5 27 – 7 42 + 4 56 + 3 30 + 5 © hamilton-trust. org. uk 20 99 – 9 Year 2/3

Challenge © hamilton-trust. org. uk 21 Year 2/3

Day 2: Subtract 1 -digit numbers from 2 -digit numbers using number facts. What is 24 - 4? What is 24 – 7? Can we split the 7 to help? Knowing that we can split the 7 into 4 and 3 makes finding 24 – 7 a quick, 2 -step strategy: 24 – 3 24 – 4 is 20. That’s just a place value subtraction. Then 20 – 3 = 17. That’s a number fact we know, based on 10 – 3 =7. How would you solve 34 – 7 on the bead bar? © hamilton-trust. org. uk 22 Year 2/3

Day 2: Subtract 1 -digit numbers from 2 -digit numbers using number facts. What is 44 - 7? Who can draw the steps on the number line? What is 54 - 7? Who can draw the steps on the number line? And how can you find 63 - 8? What is the ‘best’ way to split the 8? © hamilton-trust. org. uk 23 Year 2/3

Day 2: Subtract 1 -digit numbers from 2 -digit numbers using number facts. Challenge © hamilton-trust. org. uk 24 Year 2/3

Addition and Subtraction Using facts and digit patterns Objectives Day 3 Y 2: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers. Y 3: Add several numbers less than 20. © hamilton-trust. org. uk 25 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. How many beads are there on each bar? © hamilton-trust. org. uk And altogether ? 26 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. How many beads are hidden? So what number goes in the box? 7 + 3 = 10 17 + 3 = 20 © hamilton-trust. org. uk 27 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 17 + 5 + 33 17 How could we find the answer? Hint! 17 + 3 = 20 20 + 5 = 25 When adding three numbers, if we can spot a bond to 10 or 20, it helps to find the total! © hamilton-trust. org. uk 28 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 14 + 7 + 6 8 + 13 + 2 9 + 5 + 11 3 + 15 + 7 14 + 6 + 7 = 27 8 + 2 + 13= 23 11 + 9 + 5= 25 7 + 3 + 15= 25 Look for a pair of numbers that makes either 10 or 20. Calculate one of the additions. © hamilton-trust. org. uk 29 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 3 5 17 Clue – can you find a pair that makes 20? Talk to your partner – what would be an efficient way to add these 4 numbers? What is 5 + 4? © hamilton-trust. org. uk 4 And what is 20 + 9? 30 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 2 5 17 Clue – did you spot the double? Talk to your partner – what would be an efficient way to add these 4 numbers? What is 17 + 2? © hamilton-trust. org. uk 5 And what is 19 + 10? 31 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 8 10 8 Do you remember doubles? What is double 8? Talk to your partner – what would be an efficient way to add these 4 numbers? Has anyone found a different way? That’s OK as long as it’s efficient and we get the right answer! What is 16 + 4? What is 20 + 10? © hamilton-trust. org. uk 4 32 Year 2/3

Day 3: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers; Add several numbers less than 20. 4 8 10 Clue – can you find a pair that makes 10? Talk to your partner – what would be an efficient way to add these 4 numbers? Has anyone found a different way? That’s OK as long as it’s efficient and we get the right answer! What else do you know? © hamilton-trust. org. uk 6 33 Year 2/3

Investigation: Adult Sheet © hamilton-trust. org. uk 34 Year 2/3

Investigation: Child Sheet Challenge © hamilton-trust. org. uk 35 Year 2/3

Investigation Use ‘Three Dice’ from NRICH: https: //nrich. maths. org/6719 Investigate dice arrangements. © hamilton-trust. org. uk 36 Year 2/3

Challenge © hamilton-trust. org. uk 37 Year 2/3

Challenge © hamilton-trust. org. uk 19 Year 2/3

Addition and Subtraction Using facts and digit patterns Well Done! You’ve completed this unit. Objectives Day 1 Y 2: Use number facts or place value to add and subtract. Y 3: Add 1 -digit numbers to 2 -digit numbers using number facts. Day 2 Y 2: Use number facts or place value to add and subtract. Y 3: Subtract 1 -digit numbers from 2 -digit numbers using number facts. Day 3 Y 2: Know addition and subtraction facts for 10 and 20; use number facts to add three numbers. Y 3: Add several numbers less than 20. © hamilton-trust. org. uk 39 Year 2/3