Missing Numbers 1-20

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Grade KMathCounting & Number SenseCCSS K.CC.A.1CCSS K.CC.A.2

Skill: Filling in missing numbers in sequences from 1 to 20

Preview of the Missing Numbers 1-20 printable worksheet
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10 versions, each with its own answer key

Same skill and layout, a fresh set of problems in every version, so children can keep practicing without repeating a page. Problems are not repeated between versions unless a skill has only a small number of possible problems (for example, the addition facts within 10).

Download all 10 versions (one PDF)All 10 answer keys (PDF)

About this worksheet

Counting in order is a core kindergarten skill. Children who can say the number sequence and write the next number are ready for place value, addition, and telling how many. This kindergarten worksheet gives ten short number sequences between 1 and 20. Each sequence shows some numbers and leaves two blanks. Children write the missing numbers so the count continues by ones with no skips or repeats.

The sequences stay inside 1 to 20, the range kindergartners are expected to count and write. Some start near 1, and others begin in the teens, so children practice both the early numbers and the trickier teen sequence where eleven, twelve, and thirteen often get mixed up.

How to use it: invite your child to say the numbers they see out loud first, then whisper what should come next. Point to each blank and ask, "What number comes after this one?" A number line from 1 to 20, a calendar, or a hundred chart can support children who need a visual. If a blank is missed, have them recount from the start of that row rather than guessing.

The answer key lists every missing number in order. This worksheet supports Common Core standards K.CC.A.1 (count to 100 by ones and by tens) and K.CC.A.2 (count forward beginning from a given number within the known sequence). Ten versions let children keep practicing until counting on feels automatic.

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