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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 687 · 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. 1.91 + 48 =
  2. 2.247 + 19 =
  3. 3.492 + 17 =
  4. 4.148 + 49 =
  5. 5.86 + 58 =
  6. 6.299 + 58 =
  7. 7.493 + 98 =
  8. 8.239 + 18 =
  9. 9.153 + 97 =
  10. 10.222 + 79 =
  11. 11.142 + 17 =
  12. 12.43 + 47 =
  13. 13.179 + 47 =
  14. 14.496 + 58 =
  15. 15.216 + 87 =
  16. 16.396 + 69 =
  17. 17.145 + 17 =
  18. 18.119 + 17 =
  19. 19.85 + 98 =
  20. 20.80 + 58 =
  21. 21.195 + 37 =
  22. 22.300 + 78 =
  23. 23.198 + 19 =
  24. 24.193 + 67 =
  25. 25.172 + 77 =
  26. 26.102 + 17 =
  27. 27.426 + 38 =
  28. 28.118 + 17 =
  29. 29.378 + 77 =
  30. 30.41 + 17 =
  31. 31.200 + 67 =
  32. 32.489 + 39 =
  33. 33.57 + 98 =
  34. 34.403 + 47 =
  35. 35.345 + 99 =
  36. 36.261 + 89 =
  37. 37.150 + 18 =
  38. 38.46 + 27 =
  39. 39.156 + 59 =
  40. 40.50 + 68 =

Answer key

  1. 139
  2. 266
  3. 509
  4. 197
  5. 144
  6. 357
  7. 591
  8. 257
  9. 250
  10. 301
  11. 159
  12. 90
  13. 226
  14. 554
  15. 303
  16. 465
  17. 162
  18. 136
  19. 183
  20. 138
  21. 232
  22. 378
  23. 217
  24. 260
  25. 249
  26. 119
  27. 464
  28. 135
  29. 455
  30. 58
  31. 267
  32. 528
  33. 155
  34. 450
  35. 444
  36. 350
  37. 168
  38. 73
  39. 215
  40. 118

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