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Lesson · Grade 1 · Mathematics

Skip-counting by 2s and by 5s

  • Grade 1
  • Mathematics
  • 1 min 18 s
  • British Columbia
  • BC1-MA-02

Five pairs of socks on a clothesline are counted by 2s (2, 4, 6, 8, 10), and counting every sock by ones checks that there are 10. Then four hands are counted by 5s (5, 10, 15, 20), checked by "two hands make 10, and 10 and 10 make 20", and the video ends on a recap: pairs by 2s, hands by 5s.

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In one sentence

The question this lesson answers

Here are some socks on a clothesline. How many socks can you see?

Socks come in pairs, and a pair is 2 socks.

Transcript

What the lesson says

Here are some socks on a clothesline. How many socks can you see?

Socks come in pairs, and a pair is 2 socks.

Let's skip-count the pairs by 2s: 2, 4, 6, 8, 10.

We stopped at 10, so there are 10 socks.

Let's check by ones: 1, 2, 3, 4, 5, 6, 7, 8, 9, 10.

Now let's look at some hands. How many fingers can you see?

Each hand has 5 fingers: 1, 2, 3, 4, 5.

Now skip-count the hands by 5s: 5, 10, 15, 20.

We stopped at 20, so there are 20 fingers.

Let's check. Two hands make 10, and two more make 10.

10 and 10 make 20, just like we counted.

Count pairs of socks by 2s: 2, 4, 6, 8, 10. Count hands by 5s: 5, 10, 15, 20.

Curriculum

Where this fits

British Columbia, Grade 1

Mathematics, Number: number concepts to 20BC1-MA-02

Previous: Counting On and Counting Back with a FrogNext: Comparing and Ordering Numbers to 20

The outcomes and strands follow the British Columbia curriculum.

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