Montana Math MT.2.MD.11

Math2nd GradeMeasurement and Data

The Standard

Solve addition and subtraction problems of all types using data presented.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students read counts from a table, tally chart, or picture graph. They use the counts to find totals, differences, and missing amounts.
What Mastery Looks Like: A student picks the counts needed to answer a question and chooses addition or subtraction. They write an equation, solve it, and check that the answer fits the data.
Common Misconceptions: Students may add both counts when asked how many more, or use the wrong two groups from a chart. Some give the total when the question asks for a missing part.
How to Assess It: Show a table with 9 red pencils, 6 blue pencils, and 4 green pencils. Ask: How many more red pencils than blue pencils? How many red and green pencils altogether? Show an equation for each.

Lesson moves

Give pairs a tally chart of 8 apples and 5 oranges; have them build each count with counters and model the total and difference.
Show a table with 9 bus riders and 6 walkers; ask, “Which equation shows how many more rode the bus, and why?”
Play data card match: students pair small picture graphs with total, difference, and missing-part question cards, then solve each one.
Tally packed and school lunches at morning check-in; students find the total and the difference between the two counts.

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