Montana Math MT.1.NBT.1

Math1st GradeNumber and Operations in Base Ten

The Standard

Flexibly count, read, write, and represent numbers to 120.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students count from different starting numbers up to 120. They read and write numerals and show amounts with objects, drawings, or groups of tens and ones.
What Mastery Looks Like: Given 97, a student counts through 100 and writes each number through 103. They read 116 aloud and build it with 11 tens and 6 ones.
Common Misconceptions: Some students say 100 after 109 or write 110 as 1010. Others read 106 as sixteen because they ignore the zero.
How to Assess It: On an exit slip, print 108. Ask students to read it to a partner, write the next five numbers, and draw 113 with tens and ones.

Lesson moves

Give pairs 120 craft sticks and rubber bands; have them bundle tens, build 114, and write its numeral.
Show 109 and 110 on a chart and ask students to explain why 110, not 100, comes after 109.
Play a 120-chart race: start on 96, roll one die, count aloud to each landing square, and write the number; stop at 120.
Hand out printed tickets numbered 101 to 120 with 106 and 117 missing; students order them and write the missing ticket numbers.

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