Grade 2 › G2U08 Measuring Length

Grade 2 › G2U08 Measuring Length › L1
GRADE 2 · ALBERTAOUTCOME AB-G2-2M1

L1 · Measuring length by tiling and iterating (non-standard units)

Learning goal

“I can measure a length by tiling many copies of a unit, end to end with no gaps and no overlaps, and by iterating one copy of a unit along the length.”

Length — how long something is, from one end to the other end.
Unit — one copy of the thing you measure with, like one paper clip. All copies of the unit are the same size.
Tiling — laying many copies of a unit end to end to cover a length, with no gaps and no overlaps.
Iterating — moving one copy of a unit along a length, marking where it ends each time.
Worked example

Sara measures her crayon with paper clips. Step 1 - START AT THE END: she puts the first clip at the very end of the crayon. Step 2 - END TO END: she lays each clip right against the last one. No gaps. No overlaps. Step 3 - STOP AND COUNT: the last clip ends at the other end of the crayon. She counts the clips: 1, 2, 3, 4, 5. The crayon is 5 clips long. Say it plainly: tiling means many copies of one unit, end to end, covering the whole length - and the count of units is the length.

Check yourself — explain it

Why must the clips have no gaps?

Paired problem — example still visible

Tom tiles his pencil with clips, end to end, no gaps. He uses 7 clips. How long is his pencil? -> 7 clips long

Faded completion — last step is yours

"Mia tiles a ribbon with cubes, no gaps, no overlaps. She counts 6 cubes. The ribbon is ___ cubes long." -> 6

Ready to practise?

10 scored questions with a 3-rung hint ladder. Mastery needs 8/10 plus both gate questions.

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