Wyoming Math 1.NBT.1a

Math1st GradeNumber and Operations in Base Ten

The Standard

Extend the number sequences to 120. In this range: Count forward and backward, starting at any number less than 120.

2023 Wyoming Mathematics Content and Performance Standards · Extend the counting sequence.

Teacher's field guide

What Students Need to Do: Students pick up a count from a number below 120, not just from 1. They count forward or backward by ones, including across changes like 39 to 40 and 100 to 99.
What Mastery Looks Like: A student can start at 97 and say 98, 99, 100, 101 without pausing to restart at 1. They can start at 102 and count back through 100 to 99.
Common Misconceptions: Some students say 99, 100, 200 because they are unsure what follows 100. Others count forward well but skip a number when counting backward across a ten, such as going from 40 to 38.
How to Assess It: On an exit ticket, ask: Start at 98 and write the next five numbers. Then start at 102 and write the five numbers that come before it.

Lesson moves

Give pairs a 0 to 120 chart and a counter; call out 89 and have them move five spaces forward, then five back.
Ask: What changes when you count from 99 to 100, and what changes when you count back from 100 to 99?
Play Number Neighbor with cards marked 39, 98, and 105; partners draw a card and say five numbers forward or backward.
Number pretend raffle tickets 98 through 105; have students call them in order, then read the numbers backward to check.

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