Grade 3 math · J.2 · Length Relationships
Convert centimetres and millimetres
1 cm = 10 mm. Smaller units make a bigger count; bigger units make a smaller count.
See worked examples
100 mm = ___ cm
Answer: 10 cm
70 mm = ___ cm
Answer: 7 cm
2 cm = ___ mm
Answer: 20 mm
Tip: 1 cm = 10 mm. Smaller units make a bigger count; bigger units make a smaller count.
Curriculum
Common Core: 2.MD.A.2
On paper: this skill is in the printable pack Grade 3 Common Core Math: Geometry and Measurement, with an answer key.
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