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Three-Digit Addition Challenge

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Three-Digit Addition Challenge

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About this activity

Add three-digit numbers quickly.

Created by

Merissa Ware
Merissa Ware
United States

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Three-Digit Addition Challenge
 

Three-Digit Addition ChallengeOnline version

Add three-digit numbers quickly.

by Merissa Ware
1

123 + 456 = ?

2

248 + 367 = ?

3

999 + 1 = ?

4

304 + 489 = ?

5

501 + 299 = ?

6

123 + 987 = ?

7

456 + 378 = ?

8

212 + 598 = ?

9

765 + 234 = ?

10

409 + 592 = ?

Feedback

Correct: 123+456=579. The other options are close but incorrect.

Correct: 248+367=615. Mistakes are due to misplacing carries.

Correct: Adding 1 to 999 yields 1000.

Correct: 304+489=793; sums near hundreds can tempt rounding.

Correct: 501+299=800. The others are off by one or more.

Correct: 123+987=1110; it's a four-digit result.

Correct: 456+378=834. Check carries to avoid mistakes.

Correct: 212+598=810; ensure alignment of digits.

Correct: 765+234=999; last digit sums to 9.

Correct: 409+592=1001; carries add up to a thousand-plus.

 
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