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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 829 · 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. 1.127 + 98 =
  2. 2.127 + 97 =
  3. 3.119 + 67 =
  4. 4.46 + 87 =
  5. 5.152 + 67 =
  6. 6.72 + 67 =
  7. 7.65 + 28 =
  8. 8.31 + 99 =
  9. 9.256 + 49 =
  10. 10.156 + 47 =
  11. 11.383 + 57 =
  12. 12.213 + 88 =
  13. 13.338 + 87 =
  14. 14.351 + 37 =
  15. 15.390 + 79 =
  16. 16.496 + 79 =
  17. 17.489 + 97 =
  18. 18.352 + 57 =
  19. 19.288 + 97 =
  20. 20.249 + 87 =
  21. 21.111 + 57 =
  22. 22.264 + 39 =
  23. 23.278 + 28 =
  24. 24.195 + 19 =
  25. 25.120 + 97 =
  26. 26.157 + 48 =
  27. 27.350 + 17 =
  28. 28.426 + 27 =
  29. 29.364 + 89 =
  30. 30.317 + 79 =
  31. 31.428 + 29 =
  32. 32.130 + 48 =
  33. 33.347 + 48 =
  34. 34.269 + 57 =
  35. 35.126 + 29 =
  36. 36.160 + 99 =
  37. 37.210 + 89 =
  38. 38.323 + 48 =
  39. 39.164 + 18 =
  40. 40.483 + 38 =

Answer key

  1. 225
  2. 224
  3. 186
  4. 133
  5. 219
  6. 139
  7. 93
  8. 130
  9. 305
  10. 203
  11. 440
  12. 301
  13. 425
  14. 388
  15. 469
  16. 575
  17. 586
  18. 409
  19. 385
  20. 336
  21. 168
  22. 303
  23. 306
  24. 214
  25. 217
  26. 205
  27. 367
  28. 453
  29. 453
  30. 396
  31. 457
  32. 178
  33. 395
  34. 326
  35. 155
  36. 259
  37. 299
  38. 371
  39. 182
  40. 521

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