Montana Math MT.K.OA.2
The Standard
Solve addition and subtraction problems in context within 10. 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 short stories about groups of up to 10 objects joining or leaving. They use counters or drawings to find the answer and explain what happened.
What Mastery Looks Like
- A student can show 6 books and 3 more arriving, then count 9 altogether. They can show 8 books with 2 taken away, then explain why 6 remain.
Common Misconceptions
- Some students count only the books that arrive, not the whole group. Others add when books leave or give the number taken away instead of the number left.
How to Assess It
- Give this exit ticket: “At the Salish Kootenai College library, 5 books are on a cart. Two are checked out. How many remain?” Ask students to draw how they know.
Lesson moves
Ways to Teach It
On a mat marked Salish Kootenai College library, put 4 paper books on a cart, add 3, and count the books now.
Ask, “Eight books were on a library cart, and 3 went onto shelves. Did the number on the cart grow or shrink? Why?”
Start with 5 counters, roll a die, then add or remove that many; players must say the new total and stay within 10.
Set 7 books on a classroom shelf, lend 2 to students, and have partners count how many remain for other readers.
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Printable MT.K.OA.2 Worksheet
A ready-to-print activity worksheet aligned to MT.K.OA.2, with an answer key for the teacher on its own page. No account needed.
PDF, US Letter, prints cleanly in black and white.
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