Find the Missing Numbers Worksheet

Kids can know how to count and still stall when a number is missing in the middle. This printable asks a first grader to complete four short number trails, then use simple addition and subtraction equations with one missing number. The numbers stay in a friendly range from 2 to 20, so the work is about noticing what comes next, what came before, and which number makes the fact work.

This page is a good fit for a six-year-old who can count by ones and recognize most numbers to 20. If counting objects still needs practice, try the Counting and Drawing Circles Worksheet first because it lets kids match one count to one drawn object before filling in blanks. If teen numbers feel shaky, keep a number line nearby and point as you say each number together.

Sit side by side and start with the trails. Ask simple prompts like, “What number is just before this blank?” and “What comes after it?” For the equations, read the known parts aloud and use the word “what” for the blank, such as “What plus one equals thirteen?” or “Seventeen minus what equals thirteen?” Let them count up, count back, or use fingers. The goal is careful checking, not speed.

After the page is done, have your child read each completed trail from left to right and check that the numbers move by ones. Then reread each equation with the missing number filled in. For a helpful next step, the Tens and Ones Build Worksheet connects teen numbers to tens and ones, which supports number sense when trails reach 16, 17, 18, 19, and 20.