Virginia SOL K.NS.1.f
The Standard
Count backward orally by ones when given any number between 1 and 20.
Virginia Standards of Learning for Mathematics · The student will utilize flexible counting strategies to determine and describe quantities up to 100.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students begin with any given number from 1 through 20. They say each number one less in order as they count backward to 0.
What Mastery Looks Like
- A student can start at any named number from 1 through 20 and count backward to 0. The student keeps the numbers in order without restarting at 20.
Common Misconceptions
- Students may count forward, skip numbers, or repeat a number. Teen numbers often cause trouble, especially when crossing from 10 to 9.
How to Assess It
- Say, “Start at 16 and count backward by ones to 0.” Listen for the correct starting number, order, and transition from 10 to 9.
Lesson moves
Ways to Teach It
Lay number cards from 0 to 20 on the floor, then have students step backward from a called number while counting aloud.
Ask, “What number comes before 13, and how do you know?” Students explain their thinking to a partner.
Draw a starting-number card, then pass a beanbag around the circle as students say the countdown numbers in order.
Practice a rocket launch countdown, starting at different numbers from 1 through 20 and ending with “Blast off!”
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Printable K.NS.1.f Worksheet
A ready-to-print activity worksheet aligned to K.NS.1.f, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- K.NS.1.h
State the number before, without counting, when given any number between 1 and 20.
- 1.NS.1.b
Count backward orally by ones when given any number between 1 and 30.
- 1.NS.1.a
Count forward orally by ones from 0 to 120 starting at any number between 0 and 120.
- K.NS.1.e
Count forward orally by ones, within 100, starting at any given number.
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