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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 456 · 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. 1.158 + 89 =
  2. 2.169 + 17 =
  3. 3.428 + 18 =
  4. 4.323 + 28 =
  5. 5.443 + 27 =
  6. 6.198 + 87 =
  7. 7.164 + 88 =
  8. 8.371 + 97 =
  9. 9.453 + 38 =
  10. 10.380 + 97 =
  11. 11.268 + 47 =
  12. 12.58 + 27 =
  13. 13.76 + 58 =
  14. 14.369 + 97 =
  15. 15.231 + 98 =
  16. 16.192 + 99 =
  17. 17.485 + 49 =
  18. 18.48 + 59 =
  19. 19.137 + 99 =
  20. 20.197 + 68 =
  21. 21.169 + 28 =
  22. 22.107 + 38 =
  23. 23.60 + 49 =
  24. 24.33 + 98 =
  25. 25.34 + 97 =
  26. 26.84 + 17 =
  27. 27.221 + 67 =
  28. 28.297 + 98 =
  29. 29.459 + 69 =
  30. 30.119 + 28 =
  31. 31.86 + 69 =
  32. 32.371 + 99 =
  33. 33.272 + 47 =
  34. 34.232 + 68 =
  35. 35.256 + 29 =
  36. 36.93 + 18 =
  37. 37.325 + 77 =
  38. 38.232 + 98 =
  39. 39.176 + 78 =
  40. 40.270 + 59 =

Answer key

  1. 247
  2. 186
  3. 446
  4. 351
  5. 470
  6. 285
  7. 252
  8. 468
  9. 491
  10. 477
  11. 315
  12. 85
  13. 134
  14. 466
  15. 329
  16. 291
  17. 534
  18. 107
  19. 236
  20. 265
  21. 197
  22. 145
  23. 109
  24. 131
  25. 131
  26. 101
  27. 288
  28. 395
  29. 528
  30. 147
  31. 155
  32. 470
  33. 319
  34. 300
  35. 285
  36. 111
  37. 402
  38. 330
  39. 254
  40. 329

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