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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 931 · 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. 1.327 + 28 =
  2. 2.268 + 37 =
  3. 3.330 + 29 =
  4. 4.403 + 28 =
  5. 5.194 + 39 =
  6. 6.163 + 27 =
  7. 7.293 + 97 =
  8. 8.46 + 89 =
  9. 9.259 + 58 =
  10. 10.425 + 57 =
  11. 11.364 + 57 =
  12. 12.69 + 79 =
  13. 13.132 + 39 =
  14. 14.65 + 27 =
  15. 15.272 + 97 =
  16. 16.211 + 19 =
  17. 17.390 + 58 =
  18. 18.335 + 59 =
  19. 19.420 + 98 =
  20. 20.126 + 69 =
  21. 21.454 + 67 =
  22. 22.160 + 97 =
  23. 23.349 + 67 =
  24. 24.440 + 17 =
  25. 25.271 + 38 =
  26. 26.126 + 67 =
  27. 27.43 + 28 =
  28. 28.386 + 67 =
  29. 29.339 + 99 =
  30. 30.146 + 28 =
  31. 31.247 + 67 =
  32. 32.236 + 17 =
  33. 33.270 + 29 =
  34. 34.142 + 57 =
  35. 35.485 + 18 =
  36. 36.177 + 97 =
  37. 37.43 + 79 =
  38. 38.218 + 39 =
  39. 39.105 + 79 =
  40. 40.102 + 18 =

Answer key

  1. 355
  2. 305
  3. 359
  4. 431
  5. 233
  6. 190
  7. 390
  8. 135
  9. 317
  10. 482
  11. 421
  12. 148
  13. 171
  14. 92
  15. 369
  16. 230
  17. 448
  18. 394
  19. 518
  20. 195
  21. 521
  22. 257
  23. 416
  24. 457
  25. 309
  26. 193
  27. 71
  28. 453
  29. 438
  30. 174
  31. 314
  32. 253
  33. 299
  34. 199
  35. 503
  36. 274
  37. 122
  38. 257
  39. 184
  40. 120

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