1st grade missing numbers worksheets

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Missing numbers worksheets for 1st grade print eight small number charts, two rows of five, with three empty squares in each. Your child counts by ones across a row and down to the next, and writes the numbers that belong in the squares. The default print goes up to 120. The easier one stays within 50, and the harder one starts past 90 and counts over 100.

Free printable PDF worksheet, aligned to Common Core 1.NBT.A.1.

Each print is a different sheet with its own answer key. You don't need to sign up.

The kind of problems you'll get

Count by ones. Write the missing numbers in the chart.

  1. What goes between 99 and 101?

    Answer: 100

Most problems on this sheet sit beside a picture, model or diagram, so this is the worked example the sheet itself prints. The answer key on page two prints the answer under every problem.

Every print pulls a fresh set of problems at this level, so a make-up test or a second sibling never gets the same sheet.

What's on each sheet

Every version prints on US Letter or A4, with its answer key after the problems.

This sheet is one of the versions on the 1st grade counting to 120 page, with its own difficulty choices and its own answer key.

How to teach this

Read the chart the way a hundred chart works: left to right, then down to the start of the next row. Before your child writes in a square, ask what comes just before it and what comes just after it. The answer has to fit both. The hard places are the ends of the tens, 39 to 40 or 99 to 100, and the numbers past 100, where children often write 1001 for 101. Say three-digit numbers out loud as one hundred one, one hundred two, and the written number usually follows. 1.NBT.A.1 asks children to count to 120 from any starting number and to read and write those numerals, and each chart asks for both.

Watch for: Kids write the number after the box instead of the one in it, so 4, 5, then a box, then 7 gets a 7. Have them touch the box and say what comes right after 5. Kids flip teen numbers and write 71 for 17, because they hear the seven first. Ask them to say one ten and seven ones as they write the 1 and then the 7.

Common questions about 1st grade missing numbers

How is this different from the count to 120 sheet?
The count to 120 sheet mixes charts with rows that ask only for the next four numbers. This one is all charts, and the three gaps land in different places each time, so your child has to read both ways along a row.
Why does my child write 1001 for 101?
They write each part they hear: one hundred, then one. Write 100 and ask what one more looks like. The 1 for the hundred stays and only the ones place changes. The 120 chart helps here too.
Will I get a different sheet each time?
Yes. Every print starts the charts at new numbers and moves the gaps, and the answer key on page 2 matches the sheet you printed.

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Aligned to Common Core 1.NBT.A.1. Reviewed by the One more sheet team. Content version 241, updated October 2026.

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