operations · Year 3 · AC9M3N03

Column addition with regrouping

Write the numbers in columns so ones are under ones and tens are under tens. Add the ones first. If a column makes 10 or more, write the ones digit in that column and carry the ten to the next column, where it is added with the other digits. Work left, one column at a time. With three numbers a column can make 20 or more; then carry 2 tens.

Sample questions

28 + 65 = ?

2865+
  1. Line up the digits: ones under ones, tens under tens. Add from the ones.
  2. Ones: 8 + 5 = 13, write 3, carry 1. Tens: 2 + 6 + 1 = 9.
  3. 28 + 65 = 93.

Answer: 93

57 + 24 = ?

5724+
  1. Line up the digits: ones under ones, tens under tens. Add from the ones.
  2. Ones: 7 + 4 = 11, write 1, carry 1. Tens: 5 + 2 + 1 = 8.
  3. 57 + 24 = 81.

Answer: 81

18 + 46 = ?

1846+
  1. Line up the digits: ones under ones, tens under tens. Add from the ones.
  2. Ones: 8 + 6 = 14, write 4, carry 1. Tens: 1 + 4 + 1 = 6.
  3. 18 + 46 = 64.

Answer: 64

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