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Lesson · Grade 4 · Mathematics

Multiplying a three-digit number by a one-digit number with an area model

  • Grade 4
  • Mathematics
  • 57 s
  • British Columbia
  • BC4-MA-11

A rectangle 324 long and 3 wide is split into 300, 20 and 4, and each part becomes an easy fact: 3 × 300 = 900, 3 × 20 = 60 and 3 × 4 = 12. Adding the three parts gives 324 × 3 = 900 + 60 + 12 = 972, and the video ends on a one-line recap: split the number, multiply each part, then add.

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In one sentence

The question this lesson answers

What is 324 times 3?

Draw a rectangle that is 324 long and 3 wide.

Transcript

What the lesson says

What is 324 times 3?

Draw a rectangle that is 324 long and 3 wide.

Its area is 324 times 3.

324 is 300 plus 20 plus 4.

Split the rectangle the same way, into three parts.

3 times 300 is 900.

3 times 20 is 60.

3 times 4 is 12.

Now add the three parts together.

900 plus 60 plus 12 is 972.

So 324 times 3 is 972.

With an area model, split the number, multiply each part, then add.

Curriculum

Where this fits

British Columbia, Grade 4

Mathematics, Number: multiplication and division of two- or three-digit numbers by one-digit numbersBC4-MA-11

Previous: Break a number apart to multiplyNext: Dividing by Breaking the Number Apart: 96 ÷ 4

The outcomes and strands follow the British Columbia curriculum.

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