Grade 4 · Math · Lesson 9

Multiply 2- and 3-Digit Numbers

The column method (also called long multiplication) keeps digits aligned by place value so that ones, tens, and hundreds are multiplied separately and then combined. Regrouping — carrying the extra tens digit into the next column — makes this method work for any size of number.

What this lesson teaches

1Multiply a 2-digit number by a 1-digit number using the column method
2Multiply a 3-digit number by a 1-digit number using the column method
3Apply regrouping (carrying) correctly when multiplying
4Estimate multiplication products to check reasonableness

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