SME
Grade 2 Math · Problem type
Estimate lengths
Use this for “About how long is a crayon: 1 centimeter, 10 centimeters or 1 meter?”
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About how long is it?
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Good to know
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Your finger is about 1 centimeter wide. A crayon is about 10 centimeters long.
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A meter stick is 1 meter: about the height of a kitchen table.
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Pick the closest length. You do not need to measure.
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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.
Choose the unit
Use this to choose centimeters or meters for a crayon, a door or a hallway.