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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 247 · 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. 1.202 + 27 =
  2. 2.185 + 97 =
  3. 3.306 + 58 =
  4. 4.385 + 99 =
  5. 5.108 + 17 =
  6. 6.439 + 38 =
  7. 7.446 + 58 =
  8. 8.442 + 67 =
  9. 9.297 + 39 =
  10. 10.488 + 49 =
  11. 11.344 + 47 =
  12. 12.198 + 38 =
  13. 13.148 + 97 =
  14. 14.418 + 98 =
  15. 15.92 + 28 =
  16. 16.244 + 87 =
  17. 17.386 + 69 =
  18. 18.430 + 58 =
  19. 19.143 + 17 =
  20. 20.287 + 89 =
  21. 21.158 + 39 =
  22. 22.181 + 67 =
  23. 23.122 + 67 =
  24. 24.92 + 69 =
  25. 25.455 + 38 =
  26. 26.342 + 48 =
  27. 27.117 + 58 =
  28. 28.286 + 78 =
  29. 29.310 + 29 =
  30. 30.268 + 29 =
  31. 31.437 + 87 =
  32. 32.369 + 27 =
  33. 33.213 + 88 =
  34. 34.79 + 69 =
  35. 35.383 + 18 =
  36. 36.126 + 67 =
  37. 37.292 + 77 =
  38. 38.26 + 37 =
  39. 39.387 + 39 =
  40. 40.118 + 59 =

Answer key

  1. 229
  2. 282
  3. 364
  4. 484
  5. 125
  6. 477
  7. 504
  8. 509
  9. 336
  10. 537
  11. 391
  12. 236
  13. 245
  14. 516
  15. 120
  16. 331
  17. 455
  18. 488
  19. 160
  20. 376
  21. 197
  22. 248
  23. 189
  24. 161
  25. 493
  26. 390
  27. 175
  28. 364
  29. 339
  30. 297
  31. 524
  32. 396
  33. 301
  34. 148
  35. 401
  36. 193
  37. 369
  38. 63
  39. 426
  40. 177

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