Missing Numbers on a Number Line Worksheets for 1st Grade

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Grade 1MathCounting & Number SenseCCSS 1.NBT.A.1

Skill: Filling in missing numbers on number lines within 20 and within 120

Preview of the Missing Numbers on a Number Line printable worksheet
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Teaching tips and what to try next

Aimed at first graders who count past 20 and are learning numbers to 120. Have children say whether each line jumps by 1 or by 10 before writing, since mixing the step is the usual error. Sequences without a drawn line are in Missing Numbers to 120, and ordering practice is in Ordering Numbers and Counting to 120.

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)

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About this worksheet

A number line turns counting into a picture. First graders are expected to count to 120, starting at any number, and to read and write those numerals. Filling missing marks on a line builds both skills at once, because children see where each number sits and what comes before and after it.

The page has eight number lines. In Part A, four lines cover short stretches within 0 to 20, with three empty marks on each line. In Part B, four lines move into larger numbers within 120. Some of those lines count by ones, and some count by tens, so children have to notice the step size before they write. The first mark on every line is filled in as a clue. Each of the ten versions has new lines and its own answer key.

How to use it: ask your child to read the numbers that are already shown and say whether the line is jumping by 1 or by 10. Then have them tap each empty mark and say the number before writing. Crossing into a new ten or a new hundred is where most mistakes happen, so pause there and recount from the last known mark.

The answer key shows every missing number. For sequences without a drawn line, try our Missing Numbers to 120 worksheet. For putting numbers in order, try our Ordering Numbers and Counting to 120 worksheet.