Grade 2 › G2U08 Measuring Length

Grade 2 › G2U08 Measuring Length › L3
GRADE 2 · ALBERTAOUTCOME AB-G2-2M1

L3 · Measuring in centimetres

Learning goal

“I can measure length in centimetres: I tile or iterate centimetre units, and I read a ruler by starting at 0 and reading the mark at the other end.”

Centimetre (cm) — a standard unit of length. A centimetre is the same size everywhere, for everyone.
Standard unit — a unit that is the same size for all people, so everyone gets the same measure.
Ruler — a tool marked in centimetres, used to measure length.
Mark — one of the numbered lines on a ruler. The mark at the end of an object tells its length in centimetres.
Worked example

Sara measures her crayon with centimetre cubes. Each cube is exactly 1 centimetre long. Step 1: She tiles the cubes end to end along the crayon, no gaps, no overlaps. Step 2: She counts the cubes at the other end: 9 cubes. Step 3: She says the measure both ways: the crayon is 9 cubes long, and the crayon is 9 centimetres (9 cm) long. Say it plainly: a centimetre is a unit like a clip - but its size never changes. It is the same size in every classroom, in every town.

Check yourself — explain it

Why can two students in different towns both say the crayon is 9 cm?

Paired problem — example still visible

Tom tiles a sticker with centimetre cubes. He counts 5 cubes. How long is the sticker? -> 5 cm

Faded completion — last step is yours

"A worm is tiled with centimetre cubes. It takes 7 cubes. The worm is ___ cm long." -> 7

Ready to practise?

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

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