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Lesson · Grade 3 · Mathematics

Multiplying means equal groups

  • Grade 3
  • Mathematics
  • 1 min 11 s
  • British Columbia
  • BC3-MA-13

Three plates each hold 4 apples, so they are equal groups: 3 groups of 4, which adds up as 4 + 4 + 4 = 12 and skip-counts as 4, 8, 12, checked by counting every apple from 1 to 12. The video then writes 3 groups of 4 as 3 × 4 = 12, shows that the 3 is how many groups and the 4 is how many are in each group, and ends on "Multiplying is a quick way to add equal groups."

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In one sentence

The question this lesson answers

How many apples are on these 3 plates?

Each plate has 4 apples.

Transcript

What the lesson says

How many apples are on these 3 plates?

Each plate has 4 apples.

Every plate has the same number of apples, so these are equal groups.

So we have 3 groups of 4.

We can add the groups: 4 plus 4 plus 4.

That makes 12 apples.

Or we can skip-count by 4s: 4, 8, 12.

Both ways give 12.

Let's check by counting every apple: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12.

When the groups are equal, we can multiply.

We write 3 groups of 4 as 3 times 4.

The 3 tells us how many groups there are.

The 4 tells us how many are in each group.

So 3 times 4 is 12.

Multiplying is a quick way to add equal groups.

Curriculum

Where this fits

British Columbia, Grade 3

Mathematics, Number: multiplication and division conceptsBC3-MA-13

Previous: Fact families: adding and subtracting are relatedNext: Arrays: 3 rows of 4 and 4 rows of 3

The outcomes and strands follow the British Columbia curriculum.

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