Counting worksheets (1–20)
Eight grids of the numbers 1–20, each with different gaps — count along, notice what’s missing, write it in.
Best fit: Pre-K–1st grade · 8 sheets, answer keys included · Free, no sign-up
The full set: 8 worksheets with answer keys
Eight sheets in the same layout with different problems: download them as one PDF or print one at a time.
Worksheets
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Sheet 1
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Sheet 2
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Sheet 3
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Sheet 4
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Sheet 5
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Sheet 6
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Sheet 7
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Sheet 8
Answer keys
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Sheet 1 answers
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Sheet 2 answers
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Sheet 3 answers
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Sheet 4 answers
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Sheet 5 answers
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Sheet 6 answers
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Sheet 7 answers
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Sheet 8 answers
About these worksheets
Filling missing numbers into a counting grid practices three things at once: the counting sequence, numeral writing, and the harder skill of continuing a count from anywhere ("what comes after 13?"). The gaps land in different places on each of the 8 sheets, so no grid can be filled in from memory of the last one — the child has to actually count.
Grade level: these worksheets are part of our Kindergarten math worksheets and 1st grade math worksheets collections.
Frequently asked questions
What skills do missing-number grids build?
Counting sequence, numeral formation, and counting on from any starting point — the skill that separates real counting from a memorized chant.
What comes after the 1–20 grid?
The 1–100 missing number worksheet, and then hundreds-chart work: ten more, ten less, and skip counting.
Are the missing numbers the same on every sheet?
No. Each sheet blanks a different set, between 5 and 9 of the twenty, and 1 is always shown so there’s a place to start.