Two-Digit Addition with Carrying for a 9-Year-Old Louie

A kid friendly guide for a 9 year old to learn adding two digit numbers with carrying, with clear steps, visual tips, and practical examples to practice regularly.

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Welcome Louie, this lesson helps you add two digit numbers by lining up the digits and carrying when needed.

  1. Line up the numbers by place value, with ones under ones and tens under tens.
  2. Add the ones digits. If the sum is 10 or more, write the ones digit and carry 1 to the tens.
  3. Add the tens digits plus any carried 1.
  4. Write the total as the answer.

Two easy examples

  1. 23 + 19
    • Ones: 3 + 9 = 12, write 2 and carry 1
    • Tens: 2 + 1 + 1 carried = 4
    • Answer: 42
  2. 57 + 36
    • Ones: 7 + 6 = 13, write 3 and carry 1
    • Tens: 5 + 3 + 1 carried = 9
    • Answer: 93
  3. 46 + 29
    • Ones: 6 + 9 = 15, write 5 and carry 1
    • Tens: 4 + 2 + 1 carried = 7
    • Answer: 75

Tips to practice

  • Use a number line or fingers to count up
  • Check your answer by estimating

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