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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 957 · 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. 1.428 + 67 =
  2. 2.376 + 89 =
  3. 3.253 + 37 =
  4. 4.250 + 57 =
  5. 5.154 + 87 =
  6. 6.381 + 27 =
  7. 7.88 + 69 =
  8. 8.213 + 17 =
  9. 9.254 + 29 =
  10. 10.318 + 69 =
  11. 11.350 + 78 =
  12. 12.300 + 57 =
  13. 13.228 + 47 =
  14. 14.33 + 29 =
  15. 15.168 + 87 =
  16. 16.130 + 47 =
  17. 17.182 + 98 =
  18. 18.294 + 48 =
  19. 19.283 + 27 =
  20. 20.59 + 87 =
  21. 21.80 + 68 =
  22. 22.498 + 87 =
  23. 23.155 + 57 =
  24. 24.51 + 69 =
  25. 25.335 + 27 =
  26. 26.318 + 47 =
  27. 27.462 + 57 =
  28. 28.386 + 49 =
  29. 29.458 + 58 =
  30. 30.111 + 37 =
  31. 31.73 + 58 =
  32. 32.292 + 98 =
  33. 33.467 + 97 =
  34. 34.71 + 19 =
  35. 35.316 + 57 =
  36. 36.473 + 17 =
  37. 37.435 + 97 =
  38. 38.96 + 18 =
  39. 39.363 + 29 =
  40. 40.198 + 58 =

Answer key

  1. 495
  2. 465
  3. 290
  4. 307
  5. 241
  6. 408
  7. 157
  8. 230
  9. 283
  10. 387
  11. 428
  12. 357
  13. 275
  14. 62
  15. 255
  16. 177
  17. 280
  18. 342
  19. 310
  20. 146
  21. 148
  22. 585
  23. 212
  24. 120
  25. 362
  26. 365
  27. 519
  28. 435
  29. 516
  30. 148
  31. 131
  32. 390
  33. 564
  34. 90
  35. 373
  36. 490
  37. 532
  38. 114
  39. 392
  40. 256

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