More Addition and Subtraction Counting up subtraction Objectives

More Addition and Subtraction Counting up subtraction Objectives Day 1 Y 2: Use pairs to 10 to find amount to next 10. Y 3: Begin to know pairs of 2 -digit numbers that total 100. Day 2 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. Day 3 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. © hamilton-trust. org. uk 1 Year 2/3

More Addition and Subtraction Counting up subtraction Short Mental Workouts Day 1 Next multiple of 10 Day 2 Complements to multiples of 10, e. g. 57 + �= 60 Day 3 Subtraction number bonds to 10 © hamilton-trust. org. uk 2 Year 2/3

More Addition and Subtraction Counting up subtraction Short Mental Workout Next multiple of 10 © hamilton-trust. org. uk 3 Year 2/3

More Addition and Subtraction Counting up subtraction Short Mental Workout Complements to multiples of 10, e. g. 57 + �= 60 © hamilton-trust. org. uk 4 Year 2/3

More Addition and Subtraction Counting up subtraction Short Mental Workout Count in steps of 10 from 1 -digit numbers © hamilton-trust. org. uk 5 Year 2/3

More Addition and Subtraction Counting up subtraction Objectives Day 1 Y 2: Use pairs to 10 to find amount to next 10. Y 3: Begin to know pairs of 2 -digit numbers that total 100. © hamilton-trust. org. uk 7 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. 87 97 77 7 17 37 67 47 57 27 How many How many beads beads How many beads How many How more domore we do more do we do more we many do we wemany How more do we more doneed we to make do we to need maketoneed maketomore need to make need make more to make need to make 50? 10? 20? 40? 60? 30? 100? 70? 90? 80? 7 + 3 = 10 17 + 3 = 20 57 + 3 = 60 37 + 3 = 40 67 + 3 = 70 47 + 3 = 50 27 + 3 = 30 © hamilton-trust. org. uk 87 + 3 = 90 97 + 3 = 100 77 + 3 = 80 8 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. What Show 16 on Show 26 6 on 46 86 96 number What’s the your bead sentence can next string. we write? multiple of 10? 46 + 4 = 50 6 + 4 = 10 86 + 4 = 90 16 + 4 = 20 96 + 4 = 100 26 + 4 = 30 © hamilton-trust. org. uk 9 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. How many beads am I showing? How many to the next multiple of 10? How many more to 100? +3 + 30 67 67 + ? = 100 © hamilton-trust. org. uk 10 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. How many beads am I showing? How many to the next multiple of 10? +2 How many more to 100? + 50 48 48 + ? = 100 © hamilton-trust. org. uk 11 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. How many beads am I showing? How many to the next multiple of 10? How many more to 100? +6 + 20 74 74 + ? = 100 © hamilton-trust. org. uk 12 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. How many to the next multiple of 10? How many beads am I showing? +3 How many more to 100? + 70 27 27 + ? = 100 © hamilton-trust. org. uk 13 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. +8 + 20 72 What do we have to add to 72 to make 100? First count on to the next multiple of 10 Then jump 20 to 100. 72 + ? = 100 © hamilton-trust. org. uk 14 Year 2/3

Day 1: Use pairs to 10 to find amount to next 10; Begin to know pairs of 2 -digit numbers that total 100. +4 + 40 56 What do we have to add to 56 to make 100? First count on to the next multiple of 10 Then jump 40 to 100. 56 + ? = 100 © hamilton-trust. org. uk 15 Year 2/3

Challeng e What is the next 10 s number? I am the number 27. What is the next 10 s number? I am the number 54. What is the next 10 s number? I am the number 31. What is the next 10 s number? I am the number 65. What is the next 10 s number? I am the number 72. What is the next 10 s number? © hamilton-trust. org. uk 16 Challenge Year 2/3

Challenge © hamilton-trust. org. uk 17 Year 2/3

More Addition and Subtraction Counting up subtraction Objectives Day 2 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. © hamilton-trust. org. uk 18 Year 2/3

Day 2: Use pairs to 10 to find how many to the next 10; Develop mental methods of subtraction: subtract by counting up. What’s the next 10 s number? Let’s count up from 36 to 40. What do we need to add to 36 to make 40? How many from 46 to 50? 66 to 70? This is not a surprise! We know that 6 and 4 make 10, so 36 and 4 make 40! © hamilton-trust. org. uk 19 Year 2/3

Day 2: Use pairs to 10 to find how many to the next 10; Develop mental methods of subtraction: subtract by counting up. What’s the next 10 s number? What goes with 7 to make 10? So, what goes with 57 to make 60? 57 + 3 = 60 What is 60 – 3? How do you know? © hamilton-trust. org. uk Let’s count back from up from 5760 to to 60. 57. We end up where we started! 20 Year 2/3

Day 2: Use pairs to 10 to find how many to the next 10; Develop mental methods of subtraction: subtract by counting up. What’s the next 10 s number? Let’s count up from 34 to 40. What goes with 4 to make 10? So what goes with 34 to make 40? 34 + 6 = 40 © hamilton-trust. org. uk 21 Year 2/3

Day 2: Use pairs to 10 to find how many to the next 10; Develop mental methods of subtraction: subtract by counting up. What’s the next 10 s number? Let’s count up from 68 to 70. What goes with 8 to make 10? So what goes with 68 to make 70? 68 + 2 = 70 © hamilton-trust. org. uk 22 Year 2/3

Challenge © hamilton-trust. org. uk 23 Year 2/3

Day 2: Develop mental methods of subtraction: subtract by counting up. Let’s try 70 – 56. Frog starts on the smaller number and hops to the next 10. We can use Maths Frog to find the difference between two numbers. What number does he hop to? How far does he hop? 4 56 © hamilton-trust. org. uk 70 60 24 Year 2/3

Day 2: Develop mental methods of subtraction: subtract by counting up. Now Frog jumps to 70. How far does he jump? How far has Frog gone altogether? So 70 – 56 = ? 4 + 10 = ? 10 4 56 © hamilton-trust. org. uk 70 60 25 Year 2/3

Day 2: Develop mental methods of subtraction: subtract by counting up. Now try 50 – 34, like Frog, on your whiteboards. 50 34 © hamilton-trust. org. uk 26 Year 2/3

Day 2: Develop mental methods of subtraction: subtract by counting up. 6 + 10 = ? So 50 – 34 = ? … and another 10 jump from 40 to 50. First Frog hops 6 to 40. 10 6 34 © hamilton-trust. org. uk 50 40 27 Year 2/3

Day 2: Develop mental methods of subtraction: subtract by counting up. So 72 – 54 = 18 Can you see why? How will Frog count up to find 72 – 54? Frog hops 6 to 60… … and another 10 to jump from 60 to 70. . . 10 6 54 © hamilton-trust. org. uk … then 2 to hop from 70 to 72. 60 2 70 28 72 Year 2/3

Investigation: Adult Sheet © hamilton-trust. org. uk 29 Year 2/3

Investigation: Child Sheet © hamilton-trust. org. uk 30 Year 2/3

Challenge © hamilton-trust. org. uk 31 Year 2/3

More Addition and Subtraction Counting up subtraction Objectives Day 3 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. © hamilton-trust. org. uk 32 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10; Develop mental methods Who from Year of subtraction: subtract by counting up. 3 can explain how they use Frog starts at Frog. Let’s try the smaller … and then 67 – 45. number and jumps Now add the 10 … then 7 to hops 5 to the from 50 to jumps! get to 67. next 10. 60. . . 45 7 10 5 50 © hamilton-trust. org. uk 60 33 67 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10; Develop mental methods of subtraction: subtract by counting up. Now let’s try 65 - 37. Frog starts at … and then the smaller Finally addjump add a big number and … then 5 to the jumps! of 20 from hops 3 to the get to 65. 40 to 60. . . next 10. 37 5 20 3 40 © hamilton-trust. org. uk 60 34 65 Year 2/3

Challenge © hamilton-trust. org. uk 35 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10. What’s the next 10 s number? How many do we count up from 68 to reach 70? © hamilton-trust. org. uk 36 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10. How many beads do we add to 68 to make 70? 68 + 2 = 70 +2 68 © hamilton-trust. org. uk 37 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10. How many to the next 10? Mark 57 on this landmarked line. This time we can’t see the beads, so we have to work out what to add. © hamilton-trust. org. uk What number sentence can we write? 38 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10. Mark 75 on this landmarked line. How many to the next 10 s number? What number sentence can we write? © hamilton-trust. org. uk 39 Year 2/3

Day 3: Use pairs to 10 to find how many to the next 10. Mark 63 on this landmarked line. How many to the next 10 s number? What number sentence can we write? © hamilton-trust. org. uk 40 Year 2/3

Investigation: Adult Sheet © hamilton-trust. org. uk 41 Year 2/3

Investigation: Child Sheet Challenge © hamilton-trust. org. uk 42 Year 2/3

Challenge © hamilton-trust. org. uk 43 Year 2/3

More Addition and Subtraction Counting up subtraction Well Done! You’ve completed this unit. Objectives Day 1 Y 2: Use pairs to 10 to find amount to next 10. Y 3: Begin to know pairs of 2 -digit numbers that total 100. Day 2 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. Day 3 Y 2: Use pairs to 10 to find how many to the next 10. Y 3: Develop mental methods of subtraction: subtract by counting up. © hamilton-trust. org. uk 44 Year 2/3