Worksheet 1: Basic 3-Digit Addition

Section A: Simple 3-Digit Addition

1. 123 + 234 = ____
2. 345 + 456 = ____
3. 567 + 678 = ____
4. 789 + 210 = ____
5. 432 + 321 = ____

Section B: More 3-Digit Addition

1. 654 + 321 = ____
2. 876 + 543 = ____
3. 198 + 602 = ____
4. 754 + 245 = ____
5. 689 + 311 = ____

Section C: Fill in the Blanks

1. 1__3 + 234 = 367
2. 345 + 4__6 = 801
3. __67 + 678 = 1245
4. 789 + __10 = 999
5. 4__2 + 321 = 753

Worksheet 2: Addition with Carrying

Section A: 3-Digit Addition with Carrying

1. 128 + 276 = ____
2. 439 + 562 = ____
3. 784 + 239 = ____
4. 567 + 488 = ____
5. 654 + 376 = ____

Section B: More 3-Digit Addition with Carrying

1. 572 + 689 = ____
2. 783 + 527 = ____
3. 649 + 386 = ____
4. 458 + 593 = ____
5. 731 + 289 = ____

Section C: Word Problems

1. Maria has 123 apples and buys 456 more apples. How many apples does she have in total?
2. There are 345 students in the school, and 567 more students join. How many students are there now?
3. Tom has 432 marbles and wins 321 more in a game. How many marbles does he have now?
4. A library has 789 books, and they receive a donation of 210 more books. How many books do they have now?
5. Sarah collects 654 stickers and finds 376 more stickers. How many stickers does she have now?

Worksheet 3: Fun 3-Digit Addition Activities

Section A: Color by Numbers (Use sums to find the colors)

• Color spaces with sum 400-500 = Red
• Color spaces with sum 500-600 = Blue
• Color spaces with sum 600-700 = Green

(Provide a simple picture with numbered sections)

Section B: 3-Digit Addition Maze

(Start from the top and follow the correct sums to find the way out)

(Provide a maze with 3-digit addition problems on the paths)

Worksheet 4: Adding Large Numbers

Section A: Adding Larger 3-Digit Numbers

1. 732 + 256 = ____
2. 849 + 573 = ____
3. 678 + 349 = ____
4. 951 + 298 = ____
5. 845 + 374 = ____

Section B: More Practice with Larger 3-Digit Numbers

1. 978 + 563 = ____
2. 692 + 481 = ____
3. 745 + 239 = ____
4. 836 + 147 = ____
5. 983 + 217 = ____

Section C: Word Problems with Large Numbers

1. A car dealer sold 732 cars last year and 256 cars this year. How many cars were sold in total?
2. There are 849 people in one town and 573 people in another town. How many people are there in total?
3. Tom has 678 marbles and wins 349 more marbles. How many marbles does he have in total?
4. A library has 951 books and buys 298 more books. How many books do they have now?
5. Sarah collects 845 stickers and receives 374 more stickers. How many stickers does she have now?

Worksheet 5: Review and Application

Section A: Mixed 3-Digit Addition Problems

1. 567 + 234 = ____
2. 789 + 123 = ____
3. 456 + 678 = ____
4. 321 + 543 = ____
5. 234 + 567 = ____

Section B: More Mixed 3-Digit Addition Problems

1. 128 + 876 = ____
2. 349 + 562 = ____
3. 784 + 239 = ____
4. 651 + 349 = ____
5. 973 + 126 = ____

Section C: Word Problems

1. There are 456 blue balloons and 789 red balloons. How many balloons are there in total?
2. James has 123 crayons and buys 567 more crayons. How many crayons does he have now?
3. Emma reads 432 pages of a book and 321 pages of another book. How many pages has she read in total?
4. There are 789 birds in a tree, and 210 more birds join them. How many birds are there now?
5. Lily has 654 flowers and picks 376 more flowers. How many flowers does she have in total?

Section D: True or False

1. 123 + 456 = 579 (True/False)
2. 789 + 210 = 999 (True/False)
3. 345 + 567 = 912 (True/False)
4. 432 + 321 = 753 (True/False)
5. 654 + 376 = 1030 (True/False)

These worksheets provide a range of problems designed to help your students grasp 3-digit addition, starting with simple problems and gradually increasing in complexity. Feel free to print and use these in your classroom!