Montana Math MT.2.MD.2

Math2nd GradeMeasurement and Data

The Standard

Understand the relationship between unit sizes and number of units by measuring a single object using two different units of common measurement.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students measure the same object in inches and centimeters. They compare the numbers and explain why smaller units give a larger count.
What Mastery Looks Like: A student lines up both rulers at zero and measures the same length twice. They can explain that a 12-inch strip is also about 30 centimeters long because centimeters are smaller than inches.
Common Misconceptions: Students may think the object got longer because the centimeter count is larger. Some start at the end of the ruler instead of zero, or compare measurements taken along different sides of the object.
How to Assess It: Give each student a 10-inch paper strip. Ask: “Measure it in inches and centimeters. Which number is larger, and why?”

Lesson moves

Give pairs a 12-inch paper strip and rulers marked in inches and centimeters; have them measure and record both lengths.
Ask: “Why does the same strip measure 12 inches but about 30 centimeters?” Have students write one sentence using unit size.
Hand out inch and centimeter cards; students predict which unit gives a larger count for three desk objects, then measure to check.
Have students measure a notebook in inches and centimeters, then write both lengths for a pretend online listing.

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