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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 167 · 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. 1.216 + 37 =
  2. 2.152 + 59 =
  3. 3.448 + 37 =
  4. 4.93 + 69 =
  5. 5.322 + 57 =
  6. 6.443 + 28 =
  7. 7.68 + 18 =
  8. 8.103 + 17 =
  9. 9.123 + 37 =
  10. 10.298 + 27 =
  11. 11.31 + 37 =
  12. 12.426 + 99 =
  13. 13.332 + 99 =
  14. 14.67 + 98 =
  15. 15.106 + 19 =
  16. 16.155 + 17 =
  17. 17.44 + 27 =
  18. 18.83 + 27 =
  19. 19.94 + 37 =
  20. 20.91 + 57 =
  21. 21.39 + 97 =
  22. 22.210 + 68 =
  23. 23.424 + 78 =
  24. 24.53 + 77 =
  25. 25.414 + 57 =
  26. 26.170 + 88 =
  27. 27.476 + 27 =
  28. 28.447 + 97 =
  29. 29.293 + 57 =
  30. 30.297 + 98 =
  31. 31.175 + 57 =
  32. 32.30 + 18 =
  33. 33.195 + 28 =
  34. 34.271 + 37 =
  35. 35.471 + 48 =
  36. 36.451 + 48 =
  37. 37.118 + 48 =
  38. 38.318 + 19 =
  39. 39.159 + 78 =
  40. 40.120 + 17 =

Answer key

  1. 253
  2. 211
  3. 485
  4. 162
  5. 379
  6. 471
  7. 86
  8. 120
  9. 160
  10. 325
  11. 68
  12. 525
  13. 431
  14. 165
  15. 125
  16. 172
  17. 71
  18. 110
  19. 131
  20. 148
  21. 136
  22. 278
  23. 502
  24. 130
  25. 471
  26. 258
  27. 503
  28. 544
  29. 350
  30. 395
  31. 232
  32. 48
  33. 223
  34. 308
  35. 519
  36. 499
  37. 166
  38. 337
  39. 237
  40. 137

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