Mental Addition and Subtraction

Answer Key - Grade 4 Math Worksheet - Building Confidence

Add or subtract in your head.

1. 1.

   410 + 90 = ____

   500
2. 2.

   550 − 450 = ____

   100
3. 3.

   450 + 400 = ____

   850
4. 4.

   400 − 200 = ____

   200
5. 5.

   130 + 610 = ____

   740
6. 6.

   450 − 190 = ____

   260
7. 7.

   320 + 90 = ____

   410
8. 8.

   460 − 230 = ____

   230
9. 9.

   550 + 300 = ____

   850
10. 10.

    300 − 100 = ____

    200
11. 11.

    350 + 250 = ____

    600
12. 12.

    600 − 200 = ____

    400