Wyoming Math K.CC.1b

MathKindergartenCounting and Cardinality

The Standard

Count backwards by ones from 20.

2023 Wyoming Mathematics Content and Performance Standards · Know number names and the count sequence.

Teacher's field guide

What Students Need to Do: Students count aloud from 20 down to 0, saying one less each time. They keep the numbers in order through the teens and past 10.
What Mastery Looks Like: A student counts from 20 to 0 without a number chart. If stopped at 12, they can say 11 comes next.
Common Misconceptions: Students may skip a teen number, such as jumping from 16 to 14. Some switch direction at 10 and say 11 instead of 9.
How to Assess It: Ask each student to count aloud from 20 to 0 without a number chart. Note any skipped numbers or places where they switch direction.

Lesson moves

Give each student 20 counters to remove one at a time, saying how many remain after each removal.
Write 20, 19, __, 17, __ on the board and ask partners to explain which numbers fill the gaps.
Mix number cards from 0 to 20, then have pairs race to place them in countdown order and read them aloud.
Set a pretend rocket launch timer and have the class count from 20 to 0 before calling out, 'Blast off!'

Free download

$Preview of the K.CC.1b printable worksheet$

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

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