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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 996 · 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. 1.59 + 88 =
  2. 2.319 + 68 =
  3. 3.273 + 28 =
  4. 4.246 + 68 =
  5. 5.212 + 37 =
  6. 6.192 + 99 =
  7. 7.437 + 99 =
  8. 8.477 + 97 =
  9. 9.291 + 28 =
  10. 10.480 + 38 =
  11. 11.214 + 37 =
  12. 12.291 + 77 =
  13. 13.110 + 37 =
  14. 14.57 + 27 =
  15. 15.344 + 89 =
  16. 16.189 + 99 =
  17. 17.473 + 79 =
  18. 18.470 + 38 =
  19. 19.80 + 88 =
  20. 20.460 + 49 =
  21. 21.102 + 58 =
  22. 22.298 + 67 =
  23. 23.446 + 68 =
  24. 24.220 + 59 =
  25. 25.374 + 37 =
  26. 26.73 + 29 =
  27. 27.38 + 39 =
  28. 28.130 + 97 =
  29. 29.481 + 89 =
  30. 30.284 + 77 =
  31. 31.378 + 37 =
  32. 32.472 + 28 =
  33. 33.187 + 37 =
  34. 34.83 + 39 =
  35. 35.94 + 87 =
  36. 36.275 + 38 =
  37. 37.459 + 97 =
  38. 38.201 + 57 =
  39. 39.296 + 27 =
  40. 40.226 + 48 =

Answer key

  1. 147
  2. 387
  3. 301
  4. 314
  5. 249
  6. 291
  7. 536
  8. 574
  9. 319
  10. 518
  11. 251
  12. 368
  13. 147
  14. 84
  15. 433
  16. 288
  17. 552
  18. 508
  19. 168
  20. 509
  21. 160
  22. 365
  23. 514
  24. 279
  25. 411
  26. 102
  27. 77
  28. 227
  29. 570
  30. 361
  31. 415
  32. 500
  33. 224
  34. 122
  35. 181
  36. 313
  37. 556
  38. 258
  39. 323
  40. 274

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