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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 658 · 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. 1.433 + 17 =
  2. 2.109 + 28 =
  3. 3.225 + 37 =
  4. 4.95 + 38 =
  5. 5.260 + 78 =
  6. 6.90 + 28 =
  7. 7.271 + 67 =
  8. 8.246 + 59 =
  9. 9.153 + 48 =
  10. 10.97 + 18 =
  11. 11.233 + 77 =
  12. 12.133 + 18 =
  13. 13.94 + 27 =
  14. 14.36 + 38 =
  15. 15.51 + 19 =
  16. 16.437 + 48 =
  17. 17.200 + 49 =
  18. 18.295 + 97 =
  19. 19.106 + 19 =
  20. 20.330 + 77 =
  21. 21.234 + 87 =
  22. 22.320 + 37 =
  23. 23.349 + 39 =
  24. 24.497 + 59 =
  25. 25.252 + 17 =
  26. 26.43 + 38 =
  27. 27.250 + 39 =
  28. 28.272 + 88 =
  29. 29.409 + 99 =
  30. 30.220 + 77 =
  31. 31.429 + 99 =
  32. 32.158 + 79 =
  33. 33.335 + 19 =
  34. 34.294 + 68 =
  35. 35.368 + 59 =
  36. 36.75 + 99 =
  37. 37.74 + 27 =
  38. 38.59 + 57 =
  39. 39.73 + 39 =
  40. 40.136 + 19 =

Answer key

  1. 450
  2. 137
  3. 262
  4. 133
  5. 338
  6. 118
  7. 338
  8. 305
  9. 201
  10. 115
  11. 310
  12. 151
  13. 121
  14. 74
  15. 70
  16. 485
  17. 249
  18. 392
  19. 125
  20. 407
  21. 321
  22. 357
  23. 388
  24. 556
  25. 269
  26. 81
  27. 289
  28. 360
  29. 508
  30. 297
  31. 528
  32. 237
  33. 354
  34. 362
  35. 427
  36. 174
  37. 101
  38. 116
  39. 112
  40. 155

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