Counting worksheets (1–20)
The numbers 1–20 with gaps — count along, notice what’s missing, write it in.
Best fit: Pre-K–1st grade · Answer key included · Free, no sign-up
Answer key
The same sheet with every answer shown in blue — print it for marking, or hand it over for self-checking.
About these worksheets
Filling missing numbers into a counting grid practises 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 move around the grid, so it can’t be completed by pattern-matching alone — the child has to actually count. Reprint it after a week; the layout is identical but the practice still lands.
Need a different set?
The generator makes unlimited versions of this worksheet — choose the operation and difficulty, and every click is a brand-new sheet with its own answer key.
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 memorised 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.
Is there an answer key?
Yes — the same grid with the missing numbers shown in blue.