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Lesson · Grade 3 · Mathematics

A Fraction of a Group

  • Grade 3
  • Mathematics
  • 57 s
  • British Columbia
  • BC3-MA-06

Five apples, 2 red and 3 green, sit together in one group. Counting all of them gives the bottom number, 5, and counting the red ones gives the top number, 2, so 2 out of 5 apples are red. Each apple is then shown as one fifth of the group, and 2 + 3 = 5 checks the count before the recap: 2 red apples out of 5 are two fifths.

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In one sentence

The question this lesson answers

Here is a group of apples.

Let's count the apples: 1, 2, 3, 4, 5.

Transcript

What the lesson says

Here is a group of apples.

Let's count the apples: 1, 2, 3, 4, 5.

What fraction of the group is red?

The bottom number is the whole group: 5 apples.

Now count the red apples: 1, 2.

The top number is the red apples: 2.

2 out of 5 apples are red.

We say two fifths.

Each apple is one fifth of the group.

Count the red fifths: one fifth, two fifths.

Check: 2 red and 3 green make 5 apples.

So 2 red apples out of 5 are two fifths of the group.

Curriculum

Where this fits

British Columbia, Grade 3

Mathematics, Number: fraction conceptsBC3-MA-06

Previous: Writing a Fraction: The Top and Bottom NumbersNext: Adding Three-Digit Numbers with Regrouping

The outcomes and strands follow the British Columbia curriculum.

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