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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 105 · 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. 1.266 + 19 =
  2. 2.187 + 87 =
  3. 3.165 + 37 =
  4. 4.199 + 87 =
  5. 5.482 + 38 =
  6. 6.158 + 87 =
  7. 7.185 + 67 =
  8. 8.118 + 48 =
  9. 9.58 + 48 =
  10. 10.146 + 17 =
  11. 11.467 + 27 =
  12. 12.292 + 87 =
  13. 13.380 + 47 =
  14. 14.381 + 97 =
  15. 15.214 + 38 =
  16. 16.96 + 98 =
  17. 17.51 + 17 =
  18. 18.342 + 19 =
  19. 19.366 + 19 =
  20. 20.412 + 89 =
  21. 21.384 + 37 =
  22. 22.336 + 99 =
  23. 23.59 + 88 =
  24. 24.222 + 37 =
  25. 25.254 + 69 =
  26. 26.72 + 89 =
  27. 27.211 + 18 =
  28. 28.333 + 47 =
  29. 29.115 + 29 =
  30. 30.219 + 69 =
  31. 31.319 + 17 =
  32. 32.298 + 19 =
  33. 33.234 + 99 =
  34. 34.124 + 57 =
  35. 35.43 + 97 =
  36. 36.53 + 37 =
  37. 37.308 + 29 =
  38. 38.259 + 27 =
  39. 39.78 + 17 =
  40. 40.134 + 28 =

Answer key

  1. 285
  2. 274
  3. 202
  4. 286
  5. 520
  6. 245
  7. 252
  8. 166
  9. 106
  10. 163
  11. 494
  12. 379
  13. 427
  14. 478
  15. 252
  16. 194
  17. 68
  18. 361
  19. 385
  20. 501
  21. 421
  22. 435
  23. 147
  24. 259
  25. 323
  26. 161
  27. 229
  28. 380
  29. 144
  30. 288
  31. 336
  32. 317
  33. 333
  34. 181
  35. 140
  36. 90
  37. 337
  38. 286
  39. 95
  40. 162

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