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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 862 · 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. 1.358 + 59 =
  2. 2.60 + 59 =
  3. 3.41 + 47 =
  4. 4.249 + 99 =
  5. 5.405 + 19 =
  6. 6.405 + 47 =
  7. 7.95 + 69 =
  8. 8.111 + 17 =
  9. 9.189 + 29 =
  10. 10.164 + 88 =
  11. 11.278 + 67 =
  12. 12.340 + 69 =
  13. 13.396 + 88 =
  14. 14.153 + 57 =
  15. 15.75 + 37 =
  16. 16.160 + 68 =
  17. 17.452 + 58 =
  18. 18.58 + 87 =
  19. 19.279 + 89 =
  20. 20.205 + 17 =
  21. 21.448 + 18 =
  22. 22.350 + 28 =
  23. 23.192 + 29 =
  24. 24.240 + 59 =
  25. 25.219 + 58 =
  26. 26.115 + 18 =
  27. 27.486 + 58 =
  28. 28.436 + 68 =
  29. 29.417 + 58 =
  30. 30.153 + 29 =
  31. 31.67 + 17 =
  32. 32.398 + 29 =
  33. 33.399 + 19 =
  34. 34.491 + 78 =
  35. 35.390 + 28 =
  36. 36.355 + 48 =
  37. 37.272 + 89 =
  38. 38.359 + 77 =
  39. 39.321 + 28 =
  40. 40.474 + 97 =

Answer key

  1. 417
  2. 119
  3. 88
  4. 348
  5. 424
  6. 452
  7. 164
  8. 128
  9. 218
  10. 252
  11. 345
  12. 409
  13. 484
  14. 210
  15. 112
  16. 228
  17. 510
  18. 145
  19. 368
  20. 222
  21. 466
  22. 378
  23. 221
  24. 299
  25. 277
  26. 133
  27. 544
  28. 504
  29. 475
  30. 182
  31. 84
  32. 427
  33. 418
  34. 569
  35. 418
  36. 403
  37. 361
  38. 436
  39. 349
  40. 571

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