Column addition: watch it solved step by step

Add in columns with carrying, one place value at a time. Level: KS2 / KS3. Type any problem of this kind and the Lab works it out and animates every move, with a plain-words explanation of why.

Worked example: 2999 + 1

  1. Set out the sum. Write the numbers underneath each other so that the ones line up with ones, tens with tens, and so on. We add one column at a time, starting from the right.
  2. Add the ones column. Add the digits in the ones column: 9 + 1 = 10. Write 0 and carry 1 to the next column.
  3. Add the tens column. Add the digits in the tens column and the carried 1: 9 + 1 = 10. Write 0 and carry 1 to the next column.
  4. Add the hundreds column. Add the digits in the hundreds column and the carried 1: 9 + 1 = 10. Write 0 and carry 1 to the next column.
  5. Add the thousands column. Add the digits in the thousands column and the carried 1: 2 + 1 = 3. Write 3.
  6. The answer. All columns are done. 2999 + 1 = 3000.

Answer: 3000

Practise column addition with problems the Lab marks for you.

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