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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 542 · 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. 1.119 + 57 =
  2. 2.61 + 18 =
  3. 3.100 + 48 =
  4. 4.87 + 88 =
  5. 5.89 + 17 =
  6. 6.306 + 58 =
  7. 7.232 + 68 =
  8. 8.373 + 79 =
  9. 9.70 + 68 =
  10. 10.158 + 67 =
  11. 11.303 + 18 =
  12. 12.44 + 29 =
  13. 13.366 + 18 =
  14. 14.126 + 18 =
  15. 15.230 + 98 =
  16. 16.141 + 37 =
  17. 17.314 + 97 =
  18. 18.401 + 59 =
  19. 19.196 + 19 =
  20. 20.200 + 28 =
  21. 21.301 + 47 =
  22. 22.492 + 39 =
  23. 23.415 + 27 =
  24. 24.479 + 78 =
  25. 25.214 + 38 =
  26. 26.144 + 29 =
  27. 27.85 + 99 =
  28. 28.130 + 19 =
  29. 29.472 + 97 =
  30. 30.202 + 48 =
  31. 31.411 + 27 =
  32. 32.56 + 79 =
  33. 33.134 + 88 =
  34. 34.282 + 17 =
  35. 35.437 + 48 =
  36. 36.418 + 18 =
  37. 37.25 + 28 =
  38. 38.214 + 18 =
  39. 39.71 + 97 =
  40. 40.128 + 57 =

Answer key

  1. 176
  2. 79
  3. 148
  4. 175
  5. 106
  6. 364
  7. 300
  8. 452
  9. 138
  10. 225
  11. 321
  12. 73
  13. 384
  14. 144
  15. 328
  16. 178
  17. 411
  18. 460
  19. 215
  20. 228
  21. 348
  22. 531
  23. 442
  24. 557
  25. 252
  26. 173
  27. 184
  28. 149
  29. 569
  30. 250
  31. 438
  32. 135
  33. 222
  34. 299
  35. 485
  36. 436
  37. 53
  38. 232
  39. 168
  40. 185

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