Virginia SOL 1.NS.1.b
The Standard
Count backward orally by ones when given any number between 1 and 30.
Virginia Standards of Learning for Mathematics · The student will utilize flexible counting strategies to determine and describe quantities up to 120.
Teacher's field guide
What This Standard Means
What Students Need to Do
- Students start with a number the teacher names and say the numbers that come before it, one at a time. They keep the sequence in order across decade changes.
What Mastery Looks Like
- Given starting numbers such as 27, 14, or 6, the student immediately says each number that comes before. The student continues accurately to 0 without counting forward first.
Common Misconceptions
- Some students always begin at 30 instead of using the given starting number. Others skip or repeat numbers, especially when moving from 20 to 19 or 10 to 9.
How to Assess It
- Say, “Start at 23 and count backward to 13.” Listen for the correct starting number, order, and transition from 20 to 19.
Lesson moves
Ways to Teach It
Give students 24 linking cubes, then have them remove one cube and say the new total until none remain.
Ask, “What comes just before 20, and how can you prove it without reciting from 1?”
Play Countdown Circle: draw a start card from 1 to 30, then students take turns saying the next lower number.
Set a pretend microwave timer below 30 seconds and count down together until the food is ready.
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Printable 1.NS.1.b Worksheet
A ready-to-print activity worksheet aligned to 1.NS.1.b, with an answer key for the teacher on its own page. No account needed.
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Related Standards
- K.NS.1.d
Count forward orally by ones from 0 to 100.
- 1.NS.1.a
Count forward orally by ones from 0 to 120 starting at any number between 0 and 120.
- K.NS.1.f
Count backward orally by ones when given any number between 1 and 20.
- K.NS.1.e
Count forward orally by ones, within 100, starting at any given number.
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