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Lesson · Grade 1 · Mathematics

Measuring length with units: from a starting line, no gaps, no overlaps

  • Grade 1
  • Mathematics
  • 1 min 1 s
  • British Columbia
  • BC1-MA-13

Children measure a pencil with cubes, starting right at its end and fixing a gap and an overlap along the way, then count to find it is 6 cubes long. Then they move a single cube along the pencil, marking where it ends each time, count 6 again and get the same answer.

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In one sentence

The question this lesson answers

How many cubes long is this pencil?

Start right at the end of the pencil.

Transcript

What the lesson says

How many cubes long is this pencil?

Start right at the end of the pencil.

Oops, a gap! Push it close, so there are no gaps.

Oops, an overlap! Move it over, so there are no overlaps.

Keep going, all the way to the other end.

Now count the cubes, one at a time.

One, two, three, four, five, six.

The pencil is six cubes long.

What if you have just one cube?

Mark where it ends, then move it along.

One, two, three, four, five, six.

Still six cubes long. We get the same answer.

Start at the end, with no gaps and no overlaps.

Curriculum

Where this fits

British Columbia, Grade 1

Mathematics, Geometry and measurement: direct measurement with non-standard units (non-uniform and uniform)BC1-MA-13

Next: Why Measuring Units Should All Be the Same Size

The outcomes and strands follow the British Columbia curriculum.

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