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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 244 · 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. 1.205 + 68 =
  2. 2.498 + 59 =
  3. 3.422 + 37 =
  4. 4.486 + 18 =
  5. 5.118 + 99 =
  6. 6.186 + 79 =
  7. 7.245 + 38 =
  8. 8.65 + 49 =
  9. 9.250 + 27 =
  10. 10.199 + 97 =
  11. 11.81 + 47 =
  12. 12.47 + 38 =
  13. 13.429 + 69 =
  14. 14.215 + 27 =
  15. 15.135 + 18 =
  16. 16.194 + 68 =
  17. 17.247 + 17 =
  18. 18.480 + 37 =
  19. 19.88 + 49 =
  20. 20.99 + 38 =
  21. 21.432 + 47 =
  22. 22.328 + 67 =
  23. 23.197 + 89 =
  24. 24.396 + 18 =
  25. 25.26 + 77 =
  26. 26.476 + 49 =
  27. 27.216 + 88 =
  28. 28.236 + 67 =
  29. 29.198 + 59 =
  30. 30.253 + 78 =
  31. 31.98 + 28 =
  32. 32.327 + 47 =
  33. 33.206 + 19 =
  34. 34.443 + 79 =
  35. 35.374 + 59 =
  36. 36.365 + 99 =
  37. 37.348 + 79 =
  38. 38.51 + 59 =
  39. 39.52 + 19 =
  40. 40.221 + 98 =

Answer key

  1. 273
  2. 557
  3. 459
  4. 504
  5. 217
  6. 265
  7. 283
  8. 114
  9. 277
  10. 296
  11. 128
  12. 85
  13. 498
  14. 242
  15. 153
  16. 262
  17. 264
  18. 517
  19. 137
  20. 137
  21. 479
  22. 395
  23. 286
  24. 414
  25. 103
  26. 525
  27. 304
  28. 303
  29. 257
  30. 331
  31. 126
  32. 374
  33. 225
  34. 522
  35. 433
  36. 464
  37. 427
  38. 110
  39. 71
  40. 319

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