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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 802 · 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. 1.29 + 98 =
  2. 2.138 + 68 =
  3. 3.496 + 99 =
  4. 4.396 + 17 =
  5. 5.383 + 58 =
  6. 6.104 + 18 =
  7. 7.376 + 17 =
  8. 8.145 + 77 =
  9. 9.259 + 37 =
  10. 10.316 + 39 =
  11. 11.197 + 17 =
  12. 12.95 + 28 =
  13. 13.379 + 89 =
  14. 14.464 + 89 =
  15. 15.334 + 57 =
  16. 16.415 + 49 =
  17. 17.257 + 27 =
  18. 18.268 + 48 =
  19. 19.480 + 27 =
  20. 20.223 + 38 =
  21. 21.86 + 78 =
  22. 22.146 + 78 =
  23. 23.58 + 29 =
  24. 24.475 + 78 =
  25. 25.376 + 79 =
  26. 26.286 + 38 =
  27. 27.340 + 37 =
  28. 28.110 + 59 =
  29. 29.422 + 49 =
  30. 30.404 + 57 =
  31. 31.31 + 68 =
  32. 32.390 + 59 =
  33. 33.442 + 27 =
  34. 34.197 + 88 =
  35. 35.257 + 17 =
  36. 36.189 + 97 =
  37. 37.467 + 47 =
  38. 38.242 + 49 =
  39. 39.227 + 27 =
  40. 40.26 + 99 =

Answer key

  1. 127
  2. 206
  3. 595
  4. 413
  5. 441
  6. 122
  7. 393
  8. 222
  9. 296
  10. 355
  11. 214
  12. 123
  13. 468
  14. 553
  15. 391
  16. 464
  17. 284
  18. 316
  19. 507
  20. 261
  21. 164
  22. 224
  23. 87
  24. 553
  25. 455
  26. 324
  27. 377
  28. 169
  29. 471
  30. 461
  31. 99
  32. 449
  33. 469
  34. 285
  35. 274
  36. 286
  37. 514
  38. 291
  39. 254
  40. 125

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