Step-by-step Maths Level 2: Adding two 2-digit numbers

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 6 tens + 2 tens. Each ten is worth ten.
   6 + 2 = 8 tens, which is 80
2. Add the ones: 3 + 2. The ones are added separately.
   3 + 2 = 5
3. Put them together: 80 + 5. The tens and ones make the total.
   80 + 5 = 85
4. Write the answer.
   85

Check. Count on from 63: you reach 85.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 5 tens + 3 tens. Each ten is worth ten.
   5 + 3 = 8 tens, which is 80
2. Add the ones: 2 + 7. The ones are added separately.
   2 + 7 = 9
3. Put them together: 80 + 9. The tens and ones make the total.
   80 + 9 = 89
4. Write the answer.
   89

Check. Count on from 52: you reach 89.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 3 tens + 2 tens. Each ten is worth ten.
   3 + 2 = 5 tens, which is 50
2. Add the ones: 4 + 4. The ones are added separately.
   4 + 4 = 8
3. Put them together: 50 + 8. The tens and ones make the total.
   50 + 8 = 58
4. Write the answer.
   58

Check. Count on from 34: you reach 58.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 6 tens + 2 tens. Each ten is worth ten.
   6 + 2 = 8 tens, which is 80
2. Add the ones: 0 + 1. The ones are added separately.
   0 + 1 = 1
3. Put them together: 80 + 1. The tens and ones make the total.
   80 + 1 = 81
4. Write the answer.
   81

Check. Count on from 60: you reach 81.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 1 tens + 2 tens. Each ten is worth ten.
   1 + 2 = 3 tens, which is 30
2. Add the ones: 7 + 1. The ones are added separately.
   7 + 1 = 8
3. Put them together: 30 + 8. The tens and ones make the total.
   30 + 8 = 38
4. Write the answer.
   38

Check. Count on from 17: you reach 38.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 2 tens + 3 tens. Each ten is worth ten.
   2 + 3 = 5 tens, which is 50
2. Add the ones: 7 + 2. The ones are added separately.
   7 + 2 = 9
3. Put them together: 50 + 9. The tens and ones make the total.
   50 + 9 = 59
4. Write the answer.
   59

Check. Count on from 27: you reach 59.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 5 tens + 1 tens. Each ten is worth ten.
   5 + 1 = 6 tens, which is 60
2. Add the ones: 1 + 3. The ones are added separately.
   1 + 3 = 4
3. Put them together: 60 + 4. The tens and ones make the total.
   60 + 4 = 64
4. Write the answer.
   64

Check. Count on from 51: you reach 64.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 1 tens + 1 tens. Each ten is worth ten.
   1 + 1 = 2 tens, which is 20
2. Add the ones: 2 + 6. The ones are added separately.
   2 + 6 = 8
3. Put them together: 20 + 8. The tens and ones make the total.
   20 + 8 = 28
4. Write the answer.
   28

Check. Count on from 12: you reach 28.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 3 tens + 4 tens. Each ten is worth ten.
   3 + 4 = 7 tens, which is 70
2. Add the ones: 8 + 1. The ones are added separately.
   8 + 1 = 9
3. Put them together: 70 + 9. The tens and ones make the total.
   70 + 9 = 79
4. Write the answer.
   79

Check. Count on from 38: you reach 79.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 4 tens + 4 tens. Each ten is worth ten.
   4 + 4 = 8 tens, which is 80
2. Add the ones: 8 + 1. The ones are added separately.
   8 + 1 = 9
3. Put them together: 80 + 9. The tens and ones make the total.
   80 + 9 = 89
4. Write the answer.
   89

Check. Count on from 48: you reach 89.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 3 tens + 6 tens. Each ten is worth ten.
   3 + 6 = 9 tens, which is 90
2. Add the ones: 1 + 1. The ones are added separately.
   1 + 1 = 2
3. Put them together: 90 + 2. The tens and ones make the total.
   90 + 2 = 92
4. Write the answer.
   92

Check. Count on from 31: you reach 92.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 7 tens + 2 tens. Each ten is worth ten.
   7 + 2 = 9 tens, which is 90
2. Add the ones: 5 + 4. The ones are added separately.
   5 + 4 = 9
3. Put them together: 90 + 9. The tens and ones make the total.
   90 + 9 = 99
4. Write the answer.
   99

Check. Count on from 75: you reach 99.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 6 tens + 1 tens. Each ten is worth ten.
   6 + 1 = 7 tens, which is 70
2. Add the ones: 0 + 1. The ones are added separately.
   0 + 1 = 1
3. Put them together: 70 + 1. The tens and ones make the total.
   70 + 1 = 71
4. Write the answer.
   71

Check. Count on from 60: you reach 71.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 8 tens + 1 tens. Each ten is worth ten.
   8 + 1 = 9 tens, which is 90
2. Add the ones: 5 + 1. The ones are added separately.
   5 + 1 = 6
3. Put them together: 90 + 6. The tens and ones make the total.
   90 + 6 = 96
4. Write the answer.
   96

Check. Count on from 85: you reach 96.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 3 tens + 5 tens. Each ten is worth ten.
   3 + 5 = 8 tens, which is 80
2. Add the ones: 8 + 1. The ones are added separately.
   8 + 1 = 9
3. Put them together: 80 + 9. The tens and ones make the total.
   80 + 9 = 89
4. Write the answer.
   89

Check. Count on from 38: you reach 89.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.

Method. Add the tens, then add the ones. Put the two answers together.

1. Add the tens: 5 tens + 1 tens. Each ten is worth ten.
   5 + 1 = 6 tens, which is 60
2. Add the ones: 8 + 1. The ones are added separately.
   8 + 1 = 9
3. Put them together: 60 + 9. The tens and ones make the total.
   60 + 9 = 69
4. Write the answer.
   69

Check. Count on from 58: you reach 69.

Watch out. Add the tens to the tens and the ones to the ones. Do not add the ones digit to the tens.