Montana Math MT.K.NBT.1
The Standard
Compose and decompose numbers from 11-19 into ten ones and further ones in multiple ways and record each composition or decomposition by a drawing or an equation.
2026 Montana Mathematics Content Standards
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students make numbers from 11 to 19 using a group of ten ones and some extra ones. They arrange the same number in more than one way and record each arrangement with a drawing or an equation.
What Mastery Looks Like
- Given 18 counters, a student groups ten and counts eight more. They show the counters in two arrangements and record each with a drawing or an equation.
Common Misconceptions
- Some students read 14 as one counter and four counters, rather than ten and four. Others count the full ten-frame again when counting the extra counters.
How to Assess It
- Give each student 15 counters and ask: “Show 15 as ten and some more in two ways. Draw or write an equation for each way.”
Lesson moves
Ways to Teach It
Give pairs 16 counters and two ten-frames; fill one frame, then rearrange the counters into a row of ten and six extras.
Show ten dots circled with five dots outside; ask, “Why does this picture show 15?”
Put number cards 11 through 19 in a bag; partners draw a card, build it with counters, and complete 10 + __ = __.
Put 10 pencils in a cup and 7 on the table; have children draw the set and count the pencils.
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Printable MT.K.NBT.1 Worksheet
A ready-to-print activity worksheet aligned to MT.K.NBT.1, with an answer key for the teacher on its own page. No account needed.
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