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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 985 · 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. 1.143 + 69 =
  2. 2.355 + 48 =
  3. 3.465 + 49 =
  4. 4.323 + 58 =
  5. 5.347 + 87 =
  6. 6.412 + 39 =
  7. 7.384 + 18 =
  8. 8.289 + 48 =
  9. 9.150 + 78 =
  10. 10.499 + 68 =
  11. 11.312 + 59 =
  12. 12.476 + 28 =
  13. 13.256 + 57 =
  14. 14.112 + 59 =
  15. 15.399 + 39 =
  16. 16.41 + 79 =
  17. 17.246 + 19 =
  18. 18.284 + 77 =
  19. 19.208 + 17 =
  20. 20.448 + 88 =
  21. 21.182 + 78 =
  22. 22.88 + 99 =
  23. 23.72 + 29 =
  24. 24.361 + 28 =
  25. 25.136 + 59 =
  26. 26.422 + 37 =
  27. 27.48 + 77 =
  28. 28.392 + 27 =
  29. 29.201 + 17 =
  30. 30.243 + 59 =
  31. 31.51 + 57 =
  32. 32.467 + 69 =
  33. 33.367 + 79 =
  34. 34.282 + 27 =
  35. 35.319 + 59 =
  36. 36.394 + 98 =
  37. 37.47 + 37 =
  38. 38.453 + 37 =
  39. 39.167 + 38 =
  40. 40.392 + 48 =

Answer key

  1. 212
  2. 403
  3. 514
  4. 381
  5. 434
  6. 451
  7. 402
  8. 337
  9. 228
  10. 567
  11. 371
  12. 504
  13. 313
  14. 171
  15. 438
  16. 120
  17. 265
  18. 361
  19. 225
  20. 536
  21. 260
  22. 187
  23. 101
  24. 389
  25. 195
  26. 459
  27. 125
  28. 419
  29. 218
  30. 302
  31. 108
  32. 536
  33. 446
  34. 309
  35. 378
  36. 492
  37. 84
  38. 490
  39. 205
  40. 440

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