$Cross-number squares: add and subtract: math puzzle for Grade 3, page 1 preview$

Math puzzle · Mathematics

Cross-number squares: add and subtract · Grade 3

Each row and column of these number grids is a number sentence. Fill up to four missing numbers in each grid so all six sentences are true, using addition and subtraction.

Grade 3 · ages 8 to 9
Medium
15 to 20 minutes
1 page
Free

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

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What the sheet says

Directions: Each row and each column is a number sentence. Fill in the missing numbers so all six sentences are true.

How it works
4 + 3 = 7
across and down too
Read each row from left to right and each column from top to bottom.
20 − 13 =
11 − 5 =
13 + 15 = 28
11 + = 16
− 4 = 9
18 − 6 =
+ 10 = 25
+ 14 = 17

What your child practices

Your child practices the math skill “Add and subtract within 100”: add and subtract two-digit numbers using place value.

Grades and ages: Grade 3, ages 8 to 9
Time: About 15 to 20 minutes
Subject: Mathematics
Level: Medium for Grade 3
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

Read the rules at the top together and try the first step side by side. Use a pencil so mistakes rub out easily, and check every answer at the end. It is pitched at the expected level for Grade 3, for practice after the skill has been taught.

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

Tip for grown-ups: Solve the worked example at the top together first, then let your child try the rest.

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