Montana Math MT.2.NBT.7

Math2nd GradeNumber and Operations in Base Ten

The Standard

Add and subtract within 1000 using multiple strategies.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students add and subtract numbers up to 1000 using more than one method. They break numbers into hundreds, tens, and ones, draw place-value models, or make jumps on an open number line.
What Mastery Looks Like: A student can solve 368 + 257 with a place-value drawing and with jumps on an open number line. They can explain the trades needed for 603 − 278 and check the answer by adding.
Common Misconceptions: Students may line up digits by the left edge, so they add ones to tens. With 403 − 176, they may subtract the smaller digit from the larger in each column instead of trading through the empty tens place.
How to Assess It: On an exit ticket, ask students to solve 368 + 257 and 603 − 278. Have them show two different methods for one problem and check both answers.

Lesson moves

Give pairs base-ten blocks to build 403 and take away 176; have them trade a hundred for tens, then a ten for ones.
Put 368 + 257 on the board and ask partners to explain how a place-value drawing matches jumps on an open number line.
Play a number-line relay: teams solve 528 − 194 with three jumps, then check by adding 194 to their answer.
Use a store flyer: give students $500 to buy a $278 bike and calculate the money left two ways.

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