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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 47 · 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. 1.106 + 78 =
  2. 2.225 + 78 =
  3. 3.440 + 99 =
  4. 4.63 + 69 =
  5. 5.169 + 87 =
  6. 6.68 + 68 =
  7. 7.496 + 29 =
  8. 8.288 + 28 =
  9. 9.291 + 88 =
  10. 10.122 + 99 =
  11. 11.374 + 59 =
  12. 12.156 + 59 =
  13. 13.305 + 87 =
  14. 14.230 + 88 =
  15. 15.335 + 19 =
  16. 16.290 + 18 =
  17. 17.52 + 37 =
  18. 18.435 + 28 =
  19. 19.171 + 97 =
  20. 20.430 + 89 =
  21. 21.414 + 68 =
  22. 22.332 + 39 =
  23. 23.272 + 79 =
  24. 24.347 + 28 =
  25. 25.63 + 49 =
  26. 26.403 + 58 =
  27. 27.495 + 67 =
  28. 28.251 + 18 =
  29. 29.138 + 67 =
  30. 30.224 + 28 =
  31. 31.275 + 38 =
  32. 32.186 + 88 =
  33. 33.163 + 37 =
  34. 34.59 + 77 =
  35. 35.379 + 49 =
  36. 36.121 + 67 =
  37. 37.269 + 87 =
  38. 38.424 + 37 =
  39. 39.88 + 78 =
  40. 40.270 + 38 =

Answer key

  1. 184
  2. 303
  3. 539
  4. 132
  5. 256
  6. 136
  7. 525
  8. 316
  9. 379
  10. 221
  11. 433
  12. 215
  13. 392
  14. 318
  15. 354
  16. 308
  17. 89
  18. 463
  19. 268
  20. 519
  21. 482
  22. 371
  23. 351
  24. 375
  25. 112
  26. 461
  27. 562
  28. 269
  29. 205
  30. 252
  31. 313
  32. 274
  33. 200
  34. 136
  35. 428
  36. 188
  37. 356
  38. 461
  39. 166
  40. 308

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