Number lines to 20: math worksheet for Kindergarten to Grade 1, page 1 preview

Math worksheet · Mathematics

Number lines to 20 · Kindergarten to Grade 1

Fill in the missing numbers on number lines counting by ones.

Kindergarten to Grade 1 · ages 5 to 7
Easy
5 to 10 minutes
1 page
Free

Goes with the game Number-Line Hop.

The answer key is a separate page for grown-ups. Sign in to download it.

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What the sheet says

Directions: Write the missing numbers on each number line.

What your child practices

Your child practices the math skill “Numbers to 20 on a number line”: locate and order whole numbers to 20.

Grades and ages: Kindergarten to Grade 1, ages 5 to 7
Time: About 5 to 10 minutes
Subject: Mathematics
Level: Easy for Kindergarten to Grade 1
Answer key: Yes, for grown-ups who sign in
Printing: 1 page, US Letter or A4, low-ink option
Updated: October 15, 2026

How to use it

Gather what the sheet asks for, such as counters, scissors or a pencil. Then let your child work through the rest, showing their thinking on the page. It is one of the easier sheets for Kindergarten to Grade 1, good as a warm-up or a first look at the skill.

An answer key comes with it as a separate page that grown-ups download after signing in.

Tip for grown-ups: Count along each line out loud before writing, so the pattern is heard as well as seen.

Done on paper? A grown-up can record it on the child's page in PlayOwl; downloading alone doesn't count as finished.