3rd Grade Adding Tens Quizzes

Have students identify the value of the addend and change only the affected place values. For 156 + 30, combine 15 tens and 3 tens to make 18 tens while keeping the six ones, producing 186. Number-line jumps can support students until they can make that change mentally.

Use a mix of mental calculations, missing addends, and estimation checks with two- and three-digit numbers. Ask students to solve 243 + 40, find the missing number in 318 + __ = 368, and explain which digit or digits changed.

Students may append a zero, add to the ones digit, or assume only one digit can change when regrouping occurs. An example such as 278 + 30 is useful because the tens combine to create another hundred, producing 308.

Use the printable PDF for a warm-up, intervention group, or paper assessment, then scan student work for grading with the Wayground for Teachers app. For whole-class review, host the quiz as a digital quiz on Wayground and discuss the strategies behind selected answers.

Common Core expects students to carry forward place-value strategies as they work with larger numbers and more complex operations. Adding tens to three-digit numbers builds from Grade 2 addition within 1,000 and supports later estimation, multi-digit addition, and mental adjustment strategies.

Give students who need support problems with open number lines or place-value charts, and give advanced students missing-addend problems or examples that cross a hundred. Wayground’s extended-time setting can support slower processors, while a dyslexia-friendly quiz version can make multi-digit numbers easier to track.

Adding tens is often review in Grade 3, but it remains important for mental math with larger numbers. Fluent students can use the strategy to estimate sums, adjust numbers, and avoid unnecessary column calculations.