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Grade 1 · Maths · Lessons
How many long?
🧱block🪢rope📏long🔢count
Measure with blocks.
The big ideaSame-size blocks, end to end, no gaps. The count is how long it is.

How it works

To measure, lay same-size blocks end to end with no gaps.

The number of blocks is how long it is.

Blocks must all be the same size, and start at the edge.

1 × 6 = 6
6 blocks in a row: the rope is 6 blocks long.

Example 1: Count the blocks

  1. A rope has 6 blocks laid along it.
  2. Count them: 1, 2, 3, 4, 5, 6.
  3. The rope is 6 blocks long.

Example 2: Start at the edge

  1. Put the first block at the start of the rope.
  2. Lay the rest with no gaps.
  3. Then count them all.

Example 3: A fair measure

  1. Some blocks have gaps between them.
  2. Gaps make the count wrong.
  3. Lay them end to end with no gaps.

Words to know

length
How long something is.
end to end
Placed in a line with no gaps.

Watch out

Try it

  1. A pencil is 5 blocks long. How long is it?
  2. Should there be gaps between blocks?
  3. Where do you start the first block?
  4. Can you mix big and small blocks?
Answers: 1. 5 blocks · 2. no · 3. at the edge · 4. no
For grown-upsMeasure a book using building bricks, then measure it again with paper clips and compare the counts.
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