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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 990 · 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. 1.142 + 57 =
  2. 2.141 + 29 =
  3. 3.425 + 68 =
  4. 4.451 + 27 =
  5. 5.337 + 98 =
  6. 6.194 + 77 =
  7. 7.425 + 97 =
  8. 8.153 + 88 =
  9. 9.161 + 48 =
  10. 10.479 + 29 =
  11. 11.492 + 28 =
  12. 12.240 + 29 =
  13. 13.496 + 47 =
  14. 14.377 + 37 =
  15. 15.227 + 88 =
  16. 16.453 + 88 =
  17. 17.114 + 87 =
  18. 18.116 + 89 =
  19. 19.445 + 77 =
  20. 20.174 + 27 =
  21. 21.140 + 29 =
  22. 22.340 + 58 =
  23. 23.450 + 39 =
  24. 24.74 + 38 =
  25. 25.253 + 27 =
  26. 26.209 + 18 =
  27. 27.283 + 49 =
  28. 28.37 + 39 =
  29. 29.133 + 59 =
  30. 30.460 + 88 =
  31. 31.459 + 39 =
  32. 32.371 + 38 =
  33. 33.308 + 29 =
  34. 34.491 + 77 =
  35. 35.43 + 17 =
  36. 36.456 + 59 =
  37. 37.122 + 18 =
  38. 38.431 + 68 =
  39. 39.188 + 18 =
  40. 40.431 + 79 =

Answer key

  1. 199
  2. 170
  3. 493
  4. 478
  5. 435
  6. 271
  7. 522
  8. 241
  9. 209
  10. 508
  11. 520
  12. 269
  13. 543
  14. 414
  15. 315
  16. 541
  17. 201
  18. 205
  19. 522
  20. 201
  21. 169
  22. 398
  23. 489
  24. 112
  25. 280
  26. 227
  27. 332
  28. 76
  29. 192
  30. 548
  31. 498
  32. 409
  33. 337
  34. 568
  35. 60
  36. 515
  37. 140
  38. 499
  39. 206
  40. 510

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