Montana Math MT.1.MD.2
The Standard
Express the length of an object as a whole number of length units. Understand that the measurement of an object is the number of same-size length units that span it with no gaps or overlaps.
2026 Montana Mathematics Content Standards
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students line up equal-size units along an object, from one end to the other, with no gaps or overlaps. They count the units and give the length as a whole number.
What Mastery Looks Like
- A student places identical cubes edge to edge along a strip and counts each cube once. They record the length in cubes and can explain why gaps would make the count wrong.
Common Misconceptions
- Students may leave gaps between cubes or overlap them. Some mix large and small units, or count the spaces between cubes instead of the cubes.
How to Assess It
- Give each student a strip cut to six linking-cube lengths and six matching cubes. Ask them to measure the strip, write its length in cubes, and explain why the cubes must touch.
Lesson moves
Ways to Teach It
Give pairs a strip cut to seven linking-cube lengths; have them line up matching cubes edge to edge and record the length.
Show two drawings of a strip measured with cubes, one with gaps; ask, 'Which drawing shows the length correctly, and why?'
Give students cards showing cubes lined up with gaps, overlaps, or neither; have them sort the cards and fix one incorrect row.
Cut bookmarks to fit exactly six identical paper clips; have students measure them and label each bookmark '6 paper clips long.'
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Printable MT.1.MD.2 Worksheet
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