Montana Math MT.4.OA.3
The Standard
Solve multistep problems in context with whole numbers and having whole-number answers using the four operations, including problems in which remainders must be interpreted, represent these problems using equations with a letter standing for the unknown quantity, and assess the reasonableness of answers using mental computation and estimation strategies. This standard should incorporate cultural context relating to Montana Indigenous Peoples and local communities.
2026 Montana Mathematics Content Standards
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students solve story problems that take two or more steps with whole numbers. They write equations with a letter for an unknown, decide what a remainder means, and check with an estimate.
What Mastery Looks Like
- A student chooses the operations in order and labels the answer with units. They can explain why 53 meals need seven trays that hold eight each, then use an estimate to check the cost.
Common Misconceptions
- Students may stop after the first calculation or choose an operation because they see a word like “each.” They may write “6 R5” when seven trays are needed, or round up when the question asks how many items are left.
How to Assess It
- Exit ticket: A fictional Little Big Horn College gathering needs 42 meals, with eight meals per tray at $15 per tray. Find the number of trays and total cost, write an equation with a letter, and check with an estimate.
Lesson moves
Ways to Teach It
Give pairs 53 counters and eight-slot tray mats; charge $12 per tray and have them model the total delivery cost.
Ask, “If 53 meals fit eight per tray, why are seven trays needed?” Have students explain with an equation.
Run Remainder Relay with cards such as 29 riders, six seats per van, $10 per van; pairs write equations and check estimates.
Plan a fictional lunch order for Salish Kootenai College: 50 meals, eight per tray, $25 per tray; budget and estimate.
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