3rd Grade Adding and Subtracting Within 1,000 Quiz: 10 Questions with Explanations

A \(332\)B \(442\)C \(432\)D \(452\)

264 + 178 = 442. The ones make 12 and the tens make 13, so you regroup twice. Forgetting to carry gives 332.

A \(562\)B \(448\)C \(538\)D \(438\)

623 – 185 = 438. You must regroup in the ones and in the tens. Subtracting the smaller digit from the larger in each column gives 562.

A \(622\)B \(632\)C \(642\)D \(532\)

285 + 300 = 585, 585 + 40 = 625, 625 + 7 = 632.

A \(800\)B \(1{,}000\)C \(900\)D \(700\)

527 rounds to 500 and 391 rounds to 400. Then 500 + 400 = 900.

A 825 ticketsB 715 ticketsC 815 ticketsD 835 tickets

358 + 467 = 825. The ones make 15 and the tens make 12 with the regrouped ten. Not regrouping gives 715.

A \(335\)B \(325\)C \(425\)D \(1{,}095\)

710 – 385 = 325. Adding 385 and 710 would give 1,095, but the total is already 710.

A \(262\)B \(338\)C \(272\)D \(362\)

Regroup 1 hundred as 10 tens, then 1 ten as 10 ones: 500 – 238 = 262. Subtracting the smaller digit in each column gives 338.

A \(317 + 297\)B \(614 + 297\)C \(317 – 297\)D \(614 + 317\)

To check a subtraction, add the difference to the number subtracted: 317 + 297 = 614.

A \(624\)B \(724\)C \(634\)D \(734\)

6 + 8 = 14, 5 + 7 + 1 = 13, 4 + 2 + 1 = 7, so the sum is 734. Forgetting both carries gives 624.

A \(418 + 367\)B \(365 + 419\)C \(502 + 289\)D \(451 + 339\)

502 + 289 = 791, which is greater than 785, 784, and 790.