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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 698 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.416 + 59 =
  2. 2.47 + 88 =
  3. 3.416 + 67 =
  4. 4.478 + 18 =
  5. 5.308 + 88 =
  6. 6.240 + 59 =
  7. 7.82 + 48 =
  8. 8.124 + 57 =
  9. 9.380 + 38 =
  10. 10.212 + 29 =
  11. 11.187 + 68 =
  12. 12.414 + 47 =
  13. 13.433 + 78 =
  14. 14.49 + 99 =
  15. 15.281 + 49 =
  16. 16.386 + 27 =
  17. 17.133 + 39 =
  18. 18.391 + 18 =
  19. 19.135 + 77 =
  20. 20.486 + 38 =
  21. 21.280 + 67 =
  22. 22.75 + 18 =
  23. 23.383 + 28 =
  24. 24.63 + 47 =
  25. 25.75 + 27 =
  26. 26.165 + 59 =
  27. 27.168 + 37 =
  28. 28.474 + 39 =
  29. 29.178 + 29 =
  30. 30.489 + 97 =
  31. 31.143 + 37 =
  32. 32.193 + 88 =
  33. 33.341 + 68 =
  34. 34.488 + 18 =
  35. 35.253 + 99 =
  36. 36.67 + 67 =
  37. 37.127 + 18 =
  38. 38.442 + 57 =
  39. 39.231 + 48 =
  40. 40.410 + 77 =

Answer key

  1. 475
  2. 135
  3. 483
  4. 496
  5. 396
  6. 299
  7. 130
  8. 181
  9. 418
  10. 241
  11. 255
  12. 461
  13. 511
  14. 148
  15. 330
  16. 413
  17. 172
  18. 409
  19. 212
  20. 524
  21. 347
  22. 93
  23. 411
  24. 110
  25. 102
  26. 224
  27. 205
  28. 513
  29. 207
  30. 586
  31. 180
  32. 281
  33. 409
  34. 506
  35. 352
  36. 134
  37. 145
  38. 499
  39. 279
  40. 487

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