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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 78 · 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. 1.142 + 59 =
  2. 2.114 + 28 =
  3. 3.144 + 19 =
  4. 4.44 + 79 =
  5. 5.470 + 38 =
  6. 6.120 + 37 =
  7. 7.216 + 27 =
  8. 8.104 + 37 =
  9. 9.57 + 18 =
  10. 10.33 + 17 =
  11. 11.424 + 37 =
  12. 12.152 + 89 =
  13. 13.301 + 17 =
  14. 14.98 + 17 =
  15. 15.173 + 57 =
  16. 16.400 + 57 =
  17. 17.273 + 67 =
  18. 18.71 + 37 =
  19. 19.294 + 87 =
  20. 20.477 + 48 =
  21. 21.124 + 18 =
  22. 22.179 + 78 =
  23. 23.302 + 69 =
  24. 24.316 + 97 =
  25. 25.96 + 58 =
  26. 26.468 + 39 =
  27. 27.481 + 67 =
  28. 28.83 + 27 =
  29. 29.330 + 77 =
  30. 30.149 + 29 =
  31. 31.277 + 37 =
  32. 32.227 + 49 =
  33. 33.488 + 87 =
  34. 34.165 + 17 =
  35. 35.355 + 18 =
  36. 36.415 + 37 =
  37. 37.271 + 89 =
  38. 38.481 + 18 =
  39. 39.86 + 87 =
  40. 40.202 + 67 =

Answer key

  1. 201
  2. 142
  3. 163
  4. 123
  5. 508
  6. 157
  7. 243
  8. 141
  9. 75
  10. 50
  11. 461
  12. 241
  13. 318
  14. 115
  15. 230
  16. 457
  17. 340
  18. 108
  19. 381
  20. 525
  21. 142
  22. 257
  23. 371
  24. 413
  25. 154
  26. 507
  27. 548
  28. 110
  29. 407
  30. 178
  31. 314
  32. 276
  33. 575
  34. 182
  35. 373
  36. 452
  37. 360
  38. 499
  39. 173
  40. 269

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