Adding and Subtracting Within 1,000: math test, Grade 3 – download the PDF

1 Mental math / 4 pts

Calculate in your head. Write only the answers.

1. \(360 + 280\)
2. \(800 - 350\)
3. \(399 + 125\)
4. \(700 - 298\)

2 Standard algorithm: addition / 3 pts

Use the standard algorithm.

1. \(456 + 278\)
2. \(385 + 497\)
3. \(249 + 356\)

3 Standard algorithm: subtraction / 4 pts

Use the standard algorithm.

1. \(862 - 437\)
2. \(540 - 276\)
3. \(700 - 418\)
4. \(913 - 575\)

4 Estimate and check / 3 pts

Look at the sum \(487 + 312\).

1. Round each number to the nearest hundred and estimate the sum.
2. Find the exact sum.
3. Use subtraction to check your exact sum.

5 Word problems / 4 pts

1. A zoo had 468 visitors in the morning and 397 visitors in the afternoon. How many visitors came in all?
2. A farmer had 920 eggs and sold 548 eggs. How many eggs are left?

6 Find the error / 2 pts

Sam wrote \(405 - 168 = 363\). Explain his mistake and give the correct answer.