Printable Math Worksheet for 8-Year-Olds: 3-Digit Addition & Subtraction with Bar Models

Free worksheet covering Math, Critical Thinking for age 8 students. Created with Learning Corner's AI-powered tools.

Get personalized worksheets for your own interests and needs

Try Worksheets Now
PDF

Instructions

  1. Carefully read the questions in each section.
  2. Solve the addition and subtraction problems. Write your answers clearly in the space provided.
  3. For the Math Detective section, first draw a bar model to represent the problem, then write out your calculation to find the answer.
  4. Try the challenge questions at the end if you feel confident!

Section 1: Addition Power-Up

Solve the following addition problems. Remember to carry over when a column adds up to 10 or more!

Set A

1.   345          2.   521          3.   678          4.   433
   + 123             +  47             +   9             + 258
  ------           ------           ------           ------

Set B

5.   281          6.   705          7.   139          8.   812
   + 465             +  92             + 555             +   6
  ------           ------           ------           ------

Set C

9.   199          10.  654          11.  360          12.  909
   +   8             + 281             +  75             +  81
  ------           ------           ------           ------

Set D

13.  476          14.  837          15.  294          16.  555
   + 189             +   5             +  38             + 345
  ------           ------           ------           ------

Set E

17.  728          18.  307          19.  158          20.  276
   + 194             + 488             +  91             + 627
  ------           ------           ------           ------

Section 2: Subtraction Sprint (No Borrowing)

These subtraction problems don't require any borrowing. Focus on your speed and accuracy!

1.   876          2.   459          3.   999          4.   287
   - 345             -  38             - 123             -   5
  ------           ------           ------           ------

5.   654          6.   788          7.   562          8.   391
   - 230             -  71             -   1             - 180
  ------           ------           ------           ------

9.   195          10.  867
   -  82             - 426
  ------           ------

Section 3: Subtraction Challenge (With Borrowing)

Now it's time for a challenge! You will need to borrow from the next column to solve these.

1.   542          2.   780          3.   325          4.   913
   - 127             -  45             - 134             -  8
  ------           ------           ------           ------

5.   800          6.   651          7.   406          8.   264
   - 234             - 448             -  19             -  77
  ------           ------           ------           ------

9.   723          10.  501
   - 589             - 312
  ------           ------

Section 4: Math Detective - Problem Solving

Read each story problem. Draw a bar model to show the parts and the whole, then solve.

  1. An ice cream shop sold 278 vanilla cones and 154 chocolate cones. How many cones did they sell in total?

    Bar Model:

    Calculation:

  2. A farmer has 450 apple trees. He planted 85 more. How many apple trees does he have now?

    Bar Model:

    Calculation:

  3. Maya read a book with 325 pages. She has read 114 pages so far. How many pages does she have left to read?

    Bar Model:

    Calculation:

  4. There are 602 students at Park Elementary. On Monday, 9 students were absent. How many students were at school?

    Bar Model:

    Calculation:

  5. A video game costs 180 coins. A new character skin costs 75 coins. How many coins do you need to buy both?

    Bar Model:

    Calculation:

  6. Liam collected 510 stamps. He gave 125 of them to his best friend. How many stamps does Liam have left?

    Bar Model:

    Calculation:

  7. The school library has 467 picture books and 388 chapter books. How many books are there altogether?

    Bar Model:

    Calculation:

  8. A train traveled 800 miles. It has 245 miles left to go on its journey. How far has it already traveled?

    Bar Model:

    Calculation:

  9. A bakery made 240 cupcakes in the morning and 175 in the afternoon. How many cupcakes did they make all day?

    Bar Model:

    Calculation:

  10. Sara had 305 stickers. She used 28 of them on a school project. How many stickers are left?

    Bar Model:

    Calculation:

Answer Key

Section 1: Addition Power-Up

  1. 468
  2. 568
  3. 687
  4. 691
  5. 746
  6. 797
  7. 694
  8. 818
  9. 207
  10. 935
  11. 435
  12. 990
  13. 665
  14. 842
  15. 332
  16. 900
  17. 922
  18. 795
  19. 249
  20. 903

Section 2: Subtraction Sprint (No Borrowing)

  1. 531
  2. 421
  3. 876
  4. 282
  5. 424
  6. 717
  7. 561
  8. 211
  9. 113
  10. 441

Section 3: Subtraction Challenge (With Borrowing)

  1. 415
  2. 735
  3. 191
  4. 905
  5. 566
  6. 203
  7. 387
  8. 187
  9. 134
  10. 189

Section 4: Math Detective - Problem Solving

  1. Answer: 432 cones. Bar Model: Two parts (278 and 154) making one whole bar. Calculation: 278 + 154 = 432
  2. Answer: 535 trees. Bar Model: Two parts (450 and 85) making one whole bar. Calculation: 450 + 85 = 535
  3. Answer: 211 pages. Bar Model: A whole bar (325) with one part shown (114) and the other part missing. Calculation: 325 - 114 = 211
  4. Answer: 593 students. Bar Model: A whole bar (602) with one part shown (9) and the other part missing. Calculation: 602 - 9 = 593
  5. Answer: 255 coins. Bar Model: Two parts (180 and 75) making one whole bar. Calculation: 180 + 75 = 255
  6. Answer: 385 stamps. Bar Model: A whole bar (510) with one part shown (125) and the other part missing. Calculation: 510 - 125 = 385
  7. Answer: 855 books. Bar Model: Two parts (467 and 388) making one whole bar. Calculation: 467 + 388 = 855
  8. Answer: 555 miles. Bar Model: A whole bar (800) with one part shown (245) and the other part missing. Calculation: 800 - 245 = 555
  9. Answer: 415 cupcakes. Bar Model: Two parts (240 and 175) making one whole bar. Calculation: 240 + 175 = 415
  10. Answer: 277 stickers. Bar Model: A whole bar (305) with one part shown (28) and the other part missing. Calculation: 305 - 28 = 277
With Worksheets, you can:
  • Reinforce key concepts
  • Provide hands-on practice
  • Customize exercises to fit your needs
  • Track your student's improvement
Try Worksheets Now