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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 273 · 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. 1.265 + 29 =
  2. 2.28 + 19 =
  3. 3.104 + 49 =
  4. 4.142 + 57 =
  5. 5.490 + 68 =
  6. 6.431 + 49 =
  7. 7.26 + 87 =
  8. 8.341 + 97 =
  9. 9.353 + 87 =
  10. 10.241 + 39 =
  11. 11.368 + 19 =
  12. 12.180 + 17 =
  13. 13.445 + 27 =
  14. 14.472 + 17 =
  15. 15.160 + 69 =
  16. 16.241 + 87 =
  17. 17.480 + 37 =
  18. 18.382 + 37 =
  19. 19.73 + 27 =
  20. 20.334 + 48 =
  21. 21.268 + 87 =
  22. 22.176 + 48 =
  23. 23.157 + 88 =
  24. 24.482 + 18 =
  25. 25.415 + 17 =
  26. 26.115 + 98 =
  27. 27.343 + 28 =
  28. 28.91 + 77 =
  29. 29.170 + 97 =
  30. 30.375 + 49 =
  31. 31.228 + 27 =
  32. 32.260 + 58 =
  33. 33.27 + 48 =
  34. 34.86 + 49 =
  35. 35.89 + 48 =
  36. 36.85 + 17 =
  37. 37.156 + 77 =
  38. 38.316 + 88 =
  39. 39.328 + 97 =
  40. 40.435 + 47 =

Answer key

  1. 294
  2. 47
  3. 153
  4. 199
  5. 558
  6. 480
  7. 113
  8. 438
  9. 440
  10. 280
  11. 387
  12. 197
  13. 472
  14. 489
  15. 229
  16. 328
  17. 517
  18. 419
  19. 100
  20. 382
  21. 355
  22. 224
  23. 245
  24. 500
  25. 432
  26. 213
  27. 371
  28. 168
  29. 267
  30. 424
  31. 255
  32. 318
  33. 75
  34. 135
  35. 137
  36. 102
  37. 233
  38. 404
  39. 425
  40. 482

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