Georgia K.NR.2.1

MathKindergartenNumerical Reasoning

The Standard

Count forward to 100 by tens and ones and backward from 20 by ones.

Georgia's K-12 Mathematics Standards · Use count sequences within 100 to count forward and backward in sequence.

Teacher's field guide

What Students Need to Do: Students say number names in order using single steps and jumps of ten. They continue forward through 100 and reverse the sequence beginning at 20.
What Mastery Looks Like: A student can start at a given number and continue without restarting at one. The student moves correctly through decade changes and gives the reverse sequence from 20 without prompts.
Common Misconceptions: Students may skip numbers or repeat a number, especially near decade changes such as 39 to 40. They may say numbers backward incorrectly or confuse counting by tens with counting ten objects.
How to Assess It: Ask each student, “Count by tens from 0 to 100, count by ones from 94 to 100, then count backward from 20 to 10.”

Lesson moves

Place number cards on the floor and have students step forward by ones, jump by tens, then walk backward from 20.
Ask students, “What changes when we move from 29 to 30, and what pattern do you hear when counting by tens?”
Play Number Relay, where partners take turns saying the next number forward, backward, or by tens without breaking the sequence.
Use a 20-second cleanup countdown, then count classroom objects in groups of ten to connect number sequences with daily routines.

Free download

$Preview of the K.NR.2.1 printable worksheet$

A ready-to-print activity worksheet aligned to K.NR.2.1, with an answer key for the teacher on its own page. No account needed.

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