Montana Math MT.K.OA.1

MathKindergartenOperations and Algebraic Thinking

The Standard

Represent addition and subtraction in multiple ways.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students show adding and taking away with objects, fingers, drawings, and spoken stories. They tell how many are there after the change.
What Mastery Looks Like: Given three blocks and two more, a student joins the blocks, draws five, and says how many there are. Given five blocks with two removed, they show and name the three left.
Common Misconceptions: Some students count a group twice when joining two groups. Others draw all the starting objects after some are taken away, or say they are adding whenever a story has two numbers.
How to Assess It: Give each student five counters and say, 'Show three, add two, and draw what happened. Now show five, take away two, and draw what happened.' Ask them to tell you each result.

Lesson moves

Act out two toy frogs joining three on a paper pond, then two frogs leaving five; have students draw each scene.
Show a picture of three birds joined by two; ask, 'What changed, and how could you show it with your fingers?'
Play Show It: draw a card with 2 + 3 or 5 - 2, then show it with fingers and a sketch.
Put three pencils in a cup, add two, and have students draw before-and-after pictures and tell how many pencils are in the cup.

Free download

$Preview of the MT.K.OA.1 printable worksheet$

A ready-to-print activity worksheet aligned to MT.K.OA.1, with an answer key for the teacher on its own page. No account needed.

PDF, US Letter, prints cleanly in black and white.

Keep exploring

Grade, subject, topic, and the complete standard are prefilled. Create one free, no account needed.