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

1 Breaking apart ★★★

Find \(124 + 235\) by adding the hundreds, the tens and the ones separately.

2 Friendly numbers ★★★

Find each sum in your head.

1. \(250 + 150\)
2. \(430 + 270\)
3. \(360 + 390\)

3 Subtracting round numbers ★★★

Subtract in your head.

1. \(800 - 300\)
2. \(750 - 200\)
3. \(640 - 130\)

4 Adding without regrouping ★★★

Use the standard algorithm to find \(342 + 516\).

5 Regrouping ones and tens ★★★

Use the standard algorithm to find \(264 + 138\).

6 Subtracting without regrouping ★★★

Use the standard algorithm to find \(879 - 345\).

7 True or false? ★★★

Ben says that \(345 + 278 = 613\). Is he right? Explain.

8 The mystery number ★★★

The sum of 285 and a mystery number is 632. Write an equation and find the mystery number.

9 Regrouping twice ★★★

Find \(732 - 485\) with the standard algorithm.

10 Subtracting across a zero ★★★

Find \(800 - 367\). Explain how you regroup.

11 Is it reasonable? ★★★

Round to the nearest hundred to estimate each answer. Then find the exact answer and compare.

1. \(618 + 283\)
2. \(742 - 389\)

12 Tickets at the stadium ★★★

A stadium sold 438 tickets on Friday and 479 tickets on Saturday. How many tickets did it sell in all?

13 Walking the trail ★★★

A trail is 750 feet long. Mia has walked 468 feet. How many feet are left to walk?

14 Fact family ★★★

Write the other three equations of the fact family of \(296 + 458 = 754\).

15 Find the error ★★★

Leo wrote \(534 - 278 = 344\). Find his mistake and give the correct answer.

16 Books read in class ★★★

Four classes took part in a reading challenge. The bar graph shows the number of books each class read.

1. How many books did classes A and B read together?
2. How many more books did class B read than class D?

17 Greater or not? ★★★

Which is greater, \(468 + 397\) or \(912 - 48\)? By how much?

18 Digit cards ★★★

You have six digit cards: 2, 3, 4, 5, 6 and 7. Use each card once to make two 3-digit numbers with the greatest possible difference. What is that difference?

19 Missing digits ★★★

Find the missing digits \(\blacksquare\) and \(\blacktriangle\) in \(3\blacksquare 4 + \blacktriangle 38 = 602\).

20 Will it fit? ★★★

A delivery truck can carry up to 1,000 pounds. It has to carry two crates of 468 pounds and 349 pounds. Estimate to the nearest hundred, then find the exact total. Can the truck carry both crates?

21 Check the answer ★★★

Eli says \(703 - 458 = 355\). Use addition to check his work. Is he right? If not, find the correct answer.

22 Museum visitors ★★★

A museum had some visitors in the morning. In the afternoon 276 more people came. In all 641 people visited. Write an equation and find how many people visited in the morning.

23 Filling the tank ★★★

A water tank holds 900 liters. It already has 478 liters. How many more liters are needed to fill it? (Hint: 1 gallon is about 3.8 liters, but here you only need the liters.)