Missing number worksheets (1–100)
A hundreds chart with a third of the numbers missing — place value practice disguised as a puzzle.
Best fit: 1st–2nd 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
On a full hundreds chart the structure does the work; take a third of the numbers away and the child has to reconstruct it — one more than 46, ten below 27, the corner where 89 must live. That’s place value reasoning, not just counting. It makes a perfect follow-up once the ordinary hundreds chart feels easy.
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Frequently asked questions
How is this different from a blank hundreds chart?
A blank chart is filled in order, start to finish. Here the anchors are scattered, so every gap is a little reasoning puzzle: use the row and column to deduce the number.
What strategies should kids use?
Rows mean one more or one less; columns mean ten more or ten less. If they’re counting from 1 every time, point out the column shortcut.
Is the answer key included?
Yes — the completed chart with the filled-in numbers shown in blue.