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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 706 · 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. 1.346 + 28 =
  2. 2.188 + 27 =
  3. 3.482 + 59 =
  4. 4.59 + 99 =
  5. 5.140 + 67 =
  6. 6.230 + 39 =
  7. 7.44 + 39 =
  8. 8.93 + 17 =
  9. 9.130 + 79 =
  10. 10.452 + 69 =
  11. 11.349 + 58 =
  12. 12.488 + 38 =
  13. 13.276 + 48 =
  14. 14.338 + 79 =
  15. 15.491 + 67 =
  16. 16.56 + 69 =
  17. 17.484 + 58 =
  18. 18.375 + 88 =
  19. 19.349 + 29 =
  20. 20.163 + 48 =
  21. 21.150 + 17 =
  22. 22.65 + 38 =
  23. 23.438 + 27 =
  24. 24.38 + 19 =
  25. 25.138 + 88 =
  26. 26.285 + 57 =
  27. 27.430 + 97 =
  28. 28.467 + 57 =
  29. 29.390 + 18 =
  30. 30.443 + 17 =
  31. 31.221 + 37 =
  32. 32.469 + 58 =
  33. 33.274 + 38 =
  34. 34.125 + 39 =
  35. 35.295 + 28 =
  36. 36.119 + 79 =
  37. 37.302 + 87 =
  38. 38.274 + 77 =
  39. 39.176 + 29 =
  40. 40.63 + 47 =

Answer key

  1. 374
  2. 215
  3. 541
  4. 158
  5. 207
  6. 269
  7. 83
  8. 110
  9. 209
  10. 521
  11. 407
  12. 526
  13. 324
  14. 417
  15. 558
  16. 125
  17. 542
  18. 463
  19. 378
  20. 211
  21. 167
  22. 103
  23. 465
  24. 57
  25. 226
  26. 342
  27. 527
  28. 524
  29. 408
  30. 460
  31. 258
  32. 527
  33. 312
  34. 164
  35. 323
  36. 198
  37. 389
  38. 351
  39. 205
  40. 110

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