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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 765 · 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. 1.274 + 28 =
  2. 2.487 + 98 =
  3. 3.131 + 37 =
  4. 4.260 + 28 =
  5. 5.182 + 89 =
  6. 6.338 + 88 =
  7. 7.199 + 17 =
  8. 8.495 + 58 =
  9. 9.444 + 69 =
  10. 10.478 + 17 =
  11. 11.157 + 37 =
  12. 12.286 + 99 =
  13. 13.112 + 27 =
  14. 14.371 + 17 =
  15. 15.392 + 17 =
  16. 16.288 + 57 =
  17. 17.385 + 38 =
  18. 18.442 + 98 =
  19. 19.258 + 29 =
  20. 20.109 + 57 =
  21. 21.380 + 79 =
  22. 22.410 + 88 =
  23. 23.380 + 19 =
  24. 24.193 + 17 =
  25. 25.84 + 17 =
  26. 26.120 + 57 =
  27. 27.252 + 89 =
  28. 28.375 + 67 =
  29. 29.398 + 89 =
  30. 30.163 + 28 =
  31. 31.282 + 27 =
  32. 32.327 + 29 =
  33. 33.412 + 17 =
  34. 34.449 + 37 =
  35. 35.260 + 59 =
  36. 36.85 + 17 =
  37. 37.454 + 28 =
  38. 38.262 + 58 =
  39. 39.454 + 38 =
  40. 40.386 + 99 =

Answer key

  1. 302
  2. 585
  3. 168
  4. 288
  5. 271
  6. 426
  7. 216
  8. 553
  9. 513
  10. 495
  11. 194
  12. 385
  13. 139
  14. 388
  15. 409
  16. 345
  17. 423
  18. 540
  19. 287
  20. 166
  21. 459
  22. 498
  23. 399
  24. 210
  25. 101
  26. 177
  27. 341
  28. 442
  29. 487
  30. 191
  31. 309
  32. 356
  33. 429
  34. 486
  35. 319
  36. 102
  37. 482
  38. 320
  39. 492
  40. 485

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