Multiply a 3-digit number by a 1-digit number

Learning focus

Learn how to multiply hundreds, tens and ones by ones.

This includes:

  • a quiz
  • a learning summary


To get started, let's see how well you know this topic already. Take the catch-up quiz below to find out.


Short multiplication

Partition the number into ones, tens and hundreds. Multiply these by the 1-digit number separately. Make sure everything is in the right place value column.

Example 1

What is 342 × 4?

Step 1 sign. 342 × 4. Incomplete answer shows 8 in the ones column.

Start by multiplying the digit in the ones by 4. 2 × 4 = 8.

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Example 2

What is 317 × 5?

Step 1 sign. 317 × 5. Incomplete answer shows 5 in the ones column with 3 carried into the tens column.

Multiply the ones by 5. 7 × 5 = 35. Keep the 5 in the ones column and carry over the 3 into the tens.

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When following the short multiplication method, always double check your working out and that each digit is in the correct place.


Play Guardians: Defenders of Mathematica to learn more and sharpen your skills on this topic.

Guardians: Defenders of Mathematica

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