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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 898 · 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. 1.131 + 29 =
  2. 2.232 + 99 =
  3. 3.215 + 28 =
  4. 4.140 + 87 =
  5. 5.250 + 68 =
  6. 6.389 + 57 =
  7. 7.427 + 18 =
  8. 8.260 + 38 =
  9. 9.178 + 98 =
  10. 10.165 + 69 =
  11. 11.303 + 47 =
  12. 12.70 + 98 =
  13. 13.150 + 38 =
  14. 14.76 + 97 =
  15. 15.439 + 87 =
  16. 16.182 + 47 =
  17. 17.432 + 39 =
  18. 18.263 + 89 =
  19. 19.94 + 29 =
  20. 20.216 + 47 =
  21. 21.499 + 69 =
  22. 22.74 + 29 =
  23. 23.152 + 57 =
  24. 24.285 + 79 =
  25. 25.276 + 38 =
  26. 26.115 + 98 =
  27. 27.322 + 99 =
  28. 28.34 + 77 =
  29. 29.424 + 99 =
  30. 30.420 + 48 =
  31. 31.422 + 69 =
  32. 32.63 + 18 =
  33. 33.220 + 98 =
  34. 34.74 + 37 =
  35. 35.422 + 47 =
  36. 36.485 + 99 =
  37. 37.88 + 29 =
  38. 38.347 + 67 =
  39. 39.409 + 87 =
  40. 40.170 + 88 =

Answer key

  1. 160
  2. 331
  3. 243
  4. 227
  5. 318
  6. 446
  7. 445
  8. 298
  9. 276
  10. 234
  11. 350
  12. 168
  13. 188
  14. 173
  15. 526
  16. 229
  17. 471
  18. 352
  19. 123
  20. 263
  21. 568
  22. 103
  23. 209
  24. 364
  25. 314
  26. 213
  27. 421
  28. 111
  29. 523
  30. 468
  31. 491
  32. 81
  33. 318
  34. 111
  35. 469
  36. 584
  37. 117
  38. 414
  39. 496
  40. 258

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