Montana Math MT.2.MD.6

Math2nd GradeMeasurement and Data

The Standard

Represent whole numbers as lengths from 0 and represent sums and differences within 100 on a number line.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students show a whole number as the distance from zero to its mark on a number line. They use jumps to show addition and subtraction within 100.
What Mastery Looks Like: A student can show 46 as the length from 0 to 46 on an evenly spaced line. They can jump 20 and then 7 from 46 to reach 73, and jump back 27 to check.
Common Misconceptions: Some students count the marks, including zero, instead of the spaces, so they call the distance from 0 to 5 six units. Others draw uneven spaces or jump right when subtracting.
How to Assess It: Give students a 0 to 100 number line. Ask them to mark the length from 0 to 42, then show 42 + 16 and 58 - 16 with labeled jumps.

Lesson moves

Tape 30 equal paper strips edge to edge, label 0 to 30, and use string to show 17, then 17 + 8.
Draw a line from 0 to 12 and ask: Why do 13 marks show a length of 12 units?
Roll two dice for tens and ones, repeat for a second number, then draw leftward jumps to show their difference.
Place a 48 cm ribbon at zero on a meter stick, then find its new endpoint after cutting off 13 cm.

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