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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 168 · 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. 1.419 + 99 =
  2. 2.354 + 77 =
  3. 3.425 + 17 =
  4. 4.304 + 38 =
  5. 5.322 + 58 =
  6. 6.330 + 39 =
  7. 7.380 + 97 =
  8. 8.133 + 99 =
  9. 9.463 + 77 =
  10. 10.332 + 77 =
  11. 11.47 + 28 =
  12. 12.204 + 68 =
  13. 13.139 + 39 =
  14. 14.340 + 68 =
  15. 15.116 + 78 =
  16. 16.348 + 99 =
  17. 17.271 + 87 =
  18. 18.74 + 38 =
  19. 19.90 + 57 =
  20. 20.198 + 77 =
  21. 21.151 + 99 =
  22. 22.495 + 78 =
  23. 23.397 + 28 =
  24. 24.131 + 48 =
  25. 25.106 + 99 =
  26. 26.98 + 19 =
  27. 27.134 + 27 =
  28. 28.58 + 19 =
  29. 29.33 + 37 =
  30. 30.264 + 39 =
  31. 31.402 + 78 =
  32. 32.148 + 79 =
  33. 33.437 + 67 =
  34. 34.473 + 79 =
  35. 35.104 + 47 =
  36. 36.399 + 67 =
  37. 37.61 + 87 =
  38. 38.125 + 58 =
  39. 39.484 + 99 =
  40. 40.101 + 47 =

Answer key

  1. 518
  2. 431
  3. 442
  4. 342
  5. 380
  6. 369
  7. 477
  8. 232
  9. 540
  10. 409
  11. 75
  12. 272
  13. 178
  14. 408
  15. 194
  16. 447
  17. 358
  18. 112
  19. 147
  20. 275
  21. 250
  22. 573
  23. 425
  24. 179
  25. 205
  26. 117
  27. 161
  28. 77
  29. 70
  30. 303
  31. 480
  32. 227
  33. 504
  34. 552
  35. 151
  36. 466
  37. 148
  38. 183
  39. 583
  40. 148

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