Montana Math MT.K.MD.2

MathKindergartenMeasurement and Data

The Standard

Directly compare two objects with a measurable attribute in common using comparative language.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students compare one feature of two objects, such as length, height, or weight. They use words like longer, shorter, heavier, and lighter to tell what they notice.
What Mastery Looks Like: A student lines up the ends of two crayons before saying which is longer. They can hold two books and say which feels heavier without judging by size alone.
Common Misconceptions: Students may compare crayons without lining up their ends. They may assume a larger book is heavier, or say only “bigger” instead of naming the feature they compared.
How to Assess It: Give each student two pencils of different lengths. Ask, “Which is longer? Show me how you know.”

Lesson moves

Give partners two crayons and have them line up one end before saying which is longer.
Place two block towers side by side and ask, “Which is taller? How can you tell?”
Play longer-or-shorter: partners draw two paper strips, line up their ends, and earn a point for a correct comparison.
At cleanup, have children hold two classroom books, one in each hand, and say which feels heavier.

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