Montana Math MT.2.NBT.2

Math2nd GradeNumber and Operations in Base Ten

The Standard

Skip-count by 5s, 10s, and 100s.

2026 Montana Mathematics Content Standards

Teacher's field guide

What Students Need to Do: Students count equal groups of five, ten, or one hundred and name each new total. They continue the count when it passes 100.
What Mastery Looks Like: A student can continue 85, 90, 95, 100, 105 without counting by ones. They can do the same with groups of ten or one hundred and explain how much each step adds.
Common Misconceptions: Some students count every object by ones instead of counting the groups. Others say 95, 100, 110 when counting by fives, or 190, 191 when counting by tens.
How to Assess It: On an exit ticket, ask students to fill in three more numbers for each pattern: 85, 90; 180, 190; and 300, 400. Have them write how much is added each time.

Lesson moves

Give pairs groups of five counters, bundles of ten straws, and hundred grids; have them add one group and record each new total.
Ask students to write why 200 comes after 190 when counting by tens.
Play count-around from 85 by fives, 180 by tens, and 300 by hundreds, with classmates checking each turn.
Show four boxes labeled 100 pencils each and ask students to count the pencils as each box arrives.

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