Step-by-step Maths Level 2: Setting out sums in columns

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   1 0 and 7 7
2. Add the ones. Work out the ones first.
   0 + 7 = 7
3. Add the tens. Then work out the tens.
   1 + 7 = 8
4. Write the answer. Read the tens, then the ones.
   87

Check. Check by taking 77 away: 87 - 77 = 10.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   8 4 and 5 4
2. Take away the ones. Work out the ones first.
   4 - 4 = 0
3. Take away the tens. Then work out the tens.
   8 - 5 = 3
4. Write the answer. Read the tens, then the ones.
   30

Check. Check by adding back: 30 + 54 = 84.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   7 7 and 5 7
2. Take away the ones. Work out the ones first.
   7 - 7 = 0
3. Take away the tens. Then work out the tens.
   7 - 5 = 2
4. Write the answer. Read the tens, then the ones.
   20

Check. Check by adding back: 20 + 57 = 77.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   3 5 and 1 2
2. Add the ones. Work out the ones first.
   5 + 2 = 7
3. Add the tens. Then work out the tens.
   3 + 1 = 4
4. Write the answer. Read the tens, then the ones.
   47

Check. Check by taking 12 away: 47 - 12 = 35.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   4 1 and 1 0
2. Take away the ones. Work out the ones first.
   1 - 0 = 1
3. Take away the tens. Then work out the tens.
   4 - 1 = 3
4. Write the answer. Read the tens, then the ones.
   31

Check. Check by adding back: 31 + 10 = 41.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   7 8 and 5 8
2. Take away the ones. Work out the ones first.
   8 - 8 = 0
3. Take away the tens. Then work out the tens.
   7 - 5 = 2
4. Write the answer. Read the tens, then the ones.
   20

Check. Check by adding back: 20 + 58 = 78.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   9 9 and 8 3
2. Take away the ones. Work out the ones first.
   9 - 3 = 6
3. Take away the tens. Then work out the tens.
   9 - 8 = 1
4. Write the answer. Read the tens, then the ones.
   16

Check. Check by adding back: 16 + 83 = 99.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   6 7 and 4 7
2. Take away the ones. Work out the ones first.
   7 - 7 = 0
3. Take away the tens. Then work out the tens.
   6 - 4 = 2
4. Write the answer. Read the tens, then the ones.
   20

Check. Check by adding back: 20 + 47 = 67.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   8 7 and 1 2
2. Add the ones. Work out the ones first.
   7 + 2 = 9
3. Add the tens. Then work out the tens.
   8 + 1 = 9
4. Write the answer. Read the tens, then the ones.
   99

Check. Check by taking 12 away: 99 - 12 = 87.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   8 0 and 1 8
2. Add the ones. Work out the ones first.
   0 + 8 = 8
3. Add the tens. Then work out the tens.
   8 + 1 = 9
4. Write the answer. Read the tens, then the ones.
   98

Check. Check by taking 18 away: 98 - 18 = 80.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   6 5 and 4 0
2. Take away the ones. Work out the ones first.
   5 - 0 = 5
3. Take away the tens. Then work out the tens.
   6 - 4 = 2
4. Write the answer. Read the tens, then the ones.
   25

Check. Check by adding back: 25 + 40 = 65.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   3 8 and 6 1
2. Add the ones. Work out the ones first.
   8 + 1 = 9
3. Add the tens. Then work out the tens.
   3 + 6 = 9
4. Write the answer. Read the tens, then the ones.
   99

Check. Check by taking 61 away: 99 - 61 = 38.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   7 9 and 3 6
2. Take away the ones. Work out the ones first.
   9 - 6 = 3
3. Take away the tens. Then work out the tens.
   7 - 3 = 4
4. Write the answer. Read the tens, then the ones.
   43

Check. Check by adding back: 43 + 36 = 79.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   3 0 and 4 8
2. Add the ones. Work out the ones first.
   0 + 8 = 8
3. Add the tens. Then work out the tens.
   3 + 4 = 7
4. Write the answer. Read the tens, then the ones.
   78

Check. Check by taking 48 away: 78 - 48 = 30.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   7 9 and 4 1
2. Take away the ones. Work out the ones first.
   9 - 1 = 8
3. Take away the tens. Then work out the tens.
   7 - 4 = 3
4. Write the answer. Read the tens, then the ones.
   38

Check. Check by adding back: 38 + 41 = 79.

Watch out. Start with the ones column. Keep each digit in its column.

Method. Write the numbers in columns with tens under tens and ones under ones. Work from the ones.

1. Write the numbers in columns. The tens go in one column and the ones in another.
   9 6 and 3 5
2. Take away the ones. Work out the ones first.
   6 - 5 = 1
3. Take away the tens. Then work out the tens.
   9 - 3 = 6
4. Write the answer. Read the tens, then the ones.
   61

Check. Check by adding back: 61 + 35 = 96.

Watch out. Start with the ones column. Keep each digit in its column.