Measure Length with Centimeters

Measure Length with Centimeters

What students learn

Students learn to estimate length with a centimeter model, measure with a ruler, and compare two objects. Start with Length: Estimate with a Centimeter Model so the idea starts with a small unit.

Why it matters

Length shows up in school supplies, crafts, and everyday objects. Length: Measure with a Centimeter Ruler shows how to line up the object and read the ruler correctly.

Learn the idea

Students should place the left end at zero, read the unit marks, and compare lengths in the same unit. Then Length: Compare Two Objects in Centimeters shows how two measured lengths can be compared with longer and shorter language.

Try it

Measure a pencil, a spoon, and a book with a ruler. Ask the student to estimate first, then measure, then say which object is longest and which is shortest.

Parent guide

Hold the ruler still and make sure the child starts at zero, not at one. If an answer seems odd, have them measure again and check the alignment.