SME
Grade 2 Math · Problem type
Choose the unit
Use this to choose centimeters or meters for a crayon, a door or a hallway.
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Would you measure it in centimeters or meters?
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Good to know
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Small things: centimeters. Big things: meters.
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A bigger unit means you need fewer of them.
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See what you know: 5 questions on this topic
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Related lessons
Measure length in inches, feet, centimeters and meters
Main lesson
Use a number line to add and subtract lengths
Use this for “A 35 cm ribbon and a 20 cm ribbon end to end: how long are they together?”
Broken ruler
Use this when the object doesn’t start at 0 on the ruler.
Relate inches and feet
Use this to measure the same object in feet and in inches.
Relate centimeters and meters
Use this to measure the same object in meters and in centimeters.
Estimate lengths
Use this for “About how long is a crayon: 1 centimeter, 10 centimeters or 1 meter?”