Adding and Subtracting Within 1,000: Grade 2 Math Test Answer Key – PDF Download

Grade 2 Add Test Answer Key: questions 1–5

Question 1: Hundreds (2 points)

1. \(4 + 3 = 7\) hundreds. \(400 + 300 = 700\)
2. \(8 – 3 = 5\) hundreds, and 50 stays. \(850 – 300 = 550\)

Scoring: 1 point for each correct answer.

Question 2: Mental math (2 points)

1. Tens go up by 1. \(467 + 10 = 477\)
2. Hundreds go down by 1. \(725 – 100 = 625\)

Scoring: 1 point for each correct answer.

Question 3: Blocks and sums (2 points)

1. Ones: \(4 + 8 = 12\). That is 1 ten and \(2\) ones. Write \(2\), carry 1. Tens: \(3 + 5 + 1 = 9\). Hundreds: \(1 + 2 = 3\). \(134 + 258 = 392\)
2. The 12 ones make 1 ten and 2 ones. Tens: \(3 + 5 + 1 = 9\). 9 tens

Scoring: 1 point for 392, 1 point for 9 tens.

Question 4: Add three-digit numbers (2 points)

1. Ones: \(7 + 9 = 16\). That is 1 ten and \(6\) ones. Write \(6\), carry 1. Tens: \(6 + 5 + 1 = 12\). That is 1 hundred and \(2\) tens. Write \(2\), carry 1. Hundreds: \(2 + 3 + 1 = 6\). \(267 + 359 = 626\)
2. Ones: \(9 + 5 = 14\). That is 1 ten and \(4\) ones. Write \(4\), carry 1. Tens: \(8 + 3 + 1 = 12\). That is 1 hundred and \(2\) tens. Write \(2\), carry 1. Hundreds: \(4 + 2 + 1 = 7\). \(489 + 235 = 724\)

Scoring: 1 point for each correct sum.

Question 5: Subtract three-digit numbers (2 points)

1. Ones: \(5 – 2 = 3\). Tens: \(4\) is less than \(8\), so trade 1 hundred for 10 tens. Now there are \(14\) tens and \(5\) hundreds. Tens: \(14 – 8 = 6\). Hundreds: \(5 – 3 = 2\). \(645 – 382 = 263\)
2. Ones: \(3\) is less than \(8\) and there are 0 tens. Trade 1 hundred for 10 tens, then trade 1 ten for 10 ones. Now there are \(6\) hundreds, \(9\) tens and \(13\) ones. Ones: \(13 – 8 = 5\). Tens: \(9 – 5 = 4\). Hundreds: \(6 – 4 = 2\). \(703 – 458 = 245\)

Scoring: 1 point for each correct difference.

Grade 2 Add Test Answer Key: questions 6–9

Question 6: Find the mistake (2 points)

1. Mei subtracted the smaller digit from the bigger digit in each column. The top digits are 3 and 4, which are smaller than 7 and 6, so she had to trade.
2. Ones: \(3\) is less than \(7\), so trade 1 ten for 10 ones. Now there are \(13\) ones and \(3\) tens. Ones: \(13 – 7 = 6\). Tens: \(3\) is less than \(6\), so trade 1 hundred for 10 tens. Now there are \(13\) tens and \(4\) hundreds. Tens: \(13 – 6 = 7\). Hundreds: \(4 – 2 = 2\). \(543 – 267 = 276\)

Check: \(276 + 267 = 543\).

Scoring: 1 point for saying she did not trade (she reversed the digits), 1 point for 276.

Question 7: Missing numbers (2 points)

1. Ones: \(0\) is less than \(7\) and there are 0 tens. Trade 1 hundred for 10 tens, then trade 1 ten for 10 ones. Now there are \(4\) hundreds, \(9\) tens and \(10\) ones. Ones: \(10 – 7 = 3\). Tens: \(9 – 8 = 1\). Hundreds: \(4 – 1 = 3\). \(500 – 187 = 313\) \(313\)
2. Ones: \(0\) is less than \(5\) and there are 0 tens. Trade 1 hundred for 10 tens, then trade 1 ten for 10 ones. Now there are \(5\) hundreds, \(9\) tens and \(10\) ones. Ones: \(10 – 5 = 5\). Tens: \(9 – 7 = 2\). Hundreds: \(5 – 2 = 3\). \(600 – 275 = 325\) \(325\)

Scoring: 1 point for each correct missing number.

Question 8: Can drive (3 points)

1. Ones: \(8 + 5 = 13\). That is 1 ten and \(3\) ones. Write \(3\), carry 1. Tens: \(2 + 6 + 1 = 9\). Hundreds: \(4 + 3 = 7\). \(428 + 365 = 793\)
2. Subtract the total from the goal. Ones: \(0\) is less than \(3\) and there are 0 tens. Trade 1 hundred for 10 tens, then trade 1 ten for 10 ones. Now there are \(8\) hundreds, \(9\) tens and \(10\) ones. Ones: \(10 – 3 = 7\). Tens: \(9 – 9 = 0\). Hundreds: \(8 – 7 = 1\). \(900 – 793 = 107\) 107 more cans

Check: \(793 + 107 = 900\).

Scoring: 1 point for 793. For part b, 1 point for subtracting 793 from 900 (or counting up) and 1 point for 107.

Question 9: Jumps of 100 (3 points)

1. \(480 + 100 = 580\), then \(580 + 100 = 680\). 680
2. \(680 – 10 = 670\). 670
3. \(670 – 100 = 570\). 570

Scoring: 1 point for each correct number: 680, 670 and 570.

Scoring summary

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Grade 2 Adding and Subtracting Within 1,000 test answer key

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