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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 311 · 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. 1.429 + 87 =
  2. 2.98 + 27 =
  3. 3.156 + 99 =
  4. 4.154 + 98 =
  5. 5.310 + 97 =
  6. 6.131 + 57 =
  7. 7.57 + 27 =
  8. 8.475 + 58 =
  9. 9.438 + 37 =
  10. 10.86 + 57 =
  11. 11.462 + 17 =
  12. 12.383 + 29 =
  13. 13.354 + 58 =
  14. 14.64 + 98 =
  15. 15.37 + 19 =
  16. 16.286 + 47 =
  17. 17.140 + 97 =
  18. 18.71 + 78 =
  19. 19.436 + 27 =
  20. 20.30 + 98 =
  21. 21.482 + 19 =
  22. 22.277 + 19 =
  23. 23.50 + 69 =
  24. 24.433 + 79 =
  25. 25.251 + 98 =
  26. 26.133 + 69 =
  27. 27.250 + 47 =
  28. 28.314 + 37 =
  29. 29.234 + 97 =
  30. 30.136 + 79 =
  31. 31.210 + 77 =
  32. 32.134 + 17 =
  33. 33.179 + 47 =
  34. 34.351 + 47 =
  35. 35.410 + 49 =
  36. 36.294 + 28 =
  37. 37.148 + 79 =
  38. 38.398 + 28 =
  39. 39.467 + 77 =
  40. 40.486 + 68 =

Answer key

  1. 516
  2. 125
  3. 255
  4. 252
  5. 407
  6. 188
  7. 84
  8. 533
  9. 475
  10. 143
  11. 479
  12. 412
  13. 412
  14. 162
  15. 56
  16. 333
  17. 237
  18. 149
  19. 463
  20. 128
  21. 501
  22. 296
  23. 119
  24. 512
  25. 349
  26. 202
  27. 297
  28. 351
  29. 331
  30. 215
  31. 287
  32. 151
  33. 226
  34. 398
  35. 459
  36. 322
  37. 227
  38. 426
  39. 544
  40. 554

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