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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 633 · 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. 1.422 + 17 =
  2. 2.99 + 17 =
  3. 3.443 + 67 =
  4. 4.276 + 17 =
  5. 5.173 + 59 =
  6. 6.381 + 37 =
  7. 7.401 + 19 =
  8. 8.363 + 18 =
  9. 9.409 + 37 =
  10. 10.277 + 47 =
  11. 11.317 + 47 =
  12. 12.91 + 18 =
  13. 13.192 + 37 =
  14. 14.145 + 39 =
  15. 15.48 + 19 =
  16. 16.322 + 89 =
  17. 17.218 + 68 =
  18. 18.215 + 87 =
  19. 19.305 + 17 =
  20. 20.302 + 48 =
  21. 21.152 + 37 =
  22. 22.438 + 49 =
  23. 23.39 + 87 =
  24. 24.78 + 17 =
  25. 25.43 + 88 =
  26. 26.346 + 57 =
  27. 27.261 + 17 =
  28. 28.88 + 27 =
  29. 29.375 + 68 =
  30. 30.350 + 79 =
  31. 31.339 + 78 =
  32. 32.475 + 57 =
  33. 33.285 + 49 =
  34. 34.471 + 48 =
  35. 35.29 + 37 =
  36. 36.306 + 39 =
  37. 37.51 + 98 =
  38. 38.49 + 77 =
  39. 39.146 + 39 =
  40. 40.212 + 79 =

Answer key

  1. 439
  2. 116
  3. 510
  4. 293
  5. 232
  6. 418
  7. 420
  8. 381
  9. 446
  10. 324
  11. 364
  12. 109
  13. 229
  14. 184
  15. 67
  16. 411
  17. 286
  18. 302
  19. 322
  20. 350
  21. 189
  22. 487
  23. 126
  24. 95
  25. 131
  26. 403
  27. 278
  28. 115
  29. 443
  30. 429
  31. 417
  32. 532
  33. 334
  34. 519
  35. 66
  36. 345
  37. 149
  38. 126
  39. 185
  40. 291

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