Montana Math MT.2.MD.3

Math2nd GradeMeasurement and Data

The Standard

Estimate lengths using units of common measurement.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students guess the lengths of objects without measuring first. They choose units such as inches, feet, centimeters, or meters and use a familiar length to guide each guess.
What Mastery Looks Like: A student estimates a pencil in inches and a classroom wall in feet or meters. They can explain what familiar length helped them make each guess.
Common Misconceptions: Some students measure first and call the result an estimate. Others choose a unit that does not fit the object, such as feet for a pencil, or think an inch and a centimeter are the same length.
How to Assess It: Exit ticket: Estimate the length of your pencil in inches and the height of the classroom door in feet. Name a familiar length that helped you make each guess.

Lesson moves

Give pairs 1-foot and 10-centimeter strips to study, then have them estimate a book's length before measuring it.
Ask, 'Would you describe our hallway's length in inches or meters? Why?' Have partners defend their choice.
Place a pencil, textbook, and jump rope at stations; partners write estimates, then measure for closest-guess points.
Show a listing for a 4-foot table; have students estimate whether it would fit along a classroom wall, then measure.

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