3rd Grade Adding and Subtracting 10s Quizzes

Have students identify how many tens are being added or removed, then adjust the tens value while preserving the ones. Use examples that cross a hundred, such as 186 + 30, so students learn to regroup conceptually rather than follow a brittle digit rule.

Use mixed problems with two- and three-digit numbers, missing values, and short real-world situations involving groups of ten. Include chains such as 245, 235, 225 so students must recognize and explain the repeated change.

Students may change the ones digit, overlook a change in the hundreds place, or subtract the smaller number from the larger regardless of order. Problems such as 392 + 20 are especially useful for checking whether they understand crossing a hundred.

Host the quiz digitally as a Wayground quiz or print the PDF for classwork, homework, or a quick intervention group. A complete answer key is included with every quiz, and teachers can grade paper submissions by scanning them in the Wayground for Teachers app.

Common Core expects Grade 3 students to use place value to round numbers and develop efficient strategies for multi-digit arithmetic. Mentally adding or subtracting tens, especially across a hundred, strengthens the place-value adjustments those later tasks require.

Give students who need processing support extended time and fewer answer choices. For enrichment, adapt the same quiz with larger three-digit starting numbers or ask students to write and justify a rule for repeated changes of 10.

Not when the problems involve three-digit numbers, crossing hundreds, missing values, or mental explanations. In Grade 3, the goal is to apply the pattern flexibly and use it as a foundation for larger-number computation.