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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 315 · 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. 1.102 + 17 =
  2. 2.482 + 57 =
  3. 3.183 + 77 =
  4. 4.28 + 27 =
  5. 5.80 + 79 =
  6. 6.107 + 27 =
  7. 7.400 + 99 =
  8. 8.210 + 67 =
  9. 9.401 + 17 =
  10. 10.77 + 37 =
  11. 11.92 + 88 =
  12. 12.153 + 28 =
  13. 13.103 + 97 =
  14. 14.466 + 37 =
  15. 15.382 + 88 =
  16. 16.174 + 39 =
  17. 17.381 + 17 =
  18. 18.114 + 17 =
  19. 19.58 + 57 =
  20. 20.249 + 77 =
  21. 21.399 + 58 =
  22. 22.357 + 39 =
  23. 23.41 + 17 =
  24. 24.399 + 77 =
  25. 25.274 + 67 =
  26. 26.368 + 19 =
  27. 27.105 + 88 =
  28. 28.195 + 98 =
  29. 29.126 + 27 =
  30. 30.310 + 67 =
  31. 31.242 + 17 =
  32. 32.358 + 99 =
  33. 33.172 + 57 =
  34. 34.278 + 39 =
  35. 35.45 + 47 =
  36. 36.268 + 37 =
  37. 37.251 + 88 =
  38. 38.80 + 38 =
  39. 39.243 + 68 =
  40. 40.280 + 48 =

Answer key

  1. 119
  2. 539
  3. 260
  4. 55
  5. 159
  6. 134
  7. 499
  8. 277
  9. 418
  10. 114
  11. 180
  12. 181
  13. 200
  14. 503
  15. 470
  16. 213
  17. 398
  18. 131
  19. 115
  20. 326
  21. 457
  22. 396
  23. 58
  24. 476
  25. 341
  26. 387
  27. 193
  28. 293
  29. 153
  30. 377
  31. 259
  32. 457
  33. 229
  34. 317
  35. 92
  36. 305
  37. 339
  38. 118
  39. 311
  40. 328

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