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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 976 · 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. 1.190 + 17 =
  2. 2.31 + 57 =
  3. 3.422 + 17 =
  4. 4.402 + 37 =
  5. 5.405 + 98 =
  6. 6.294 + 58 =
  7. 7.238 + 27 =
  8. 8.47 + 39 =
  9. 9.489 + 17 =
  10. 10.156 + 49 =
  11. 11.461 + 47 =
  12. 12.107 + 37 =
  13. 13.386 + 57 =
  14. 14.290 + 77 =
  15. 15.487 + 39 =
  16. 16.122 + 89 =
  17. 17.480 + 77 =
  18. 18.85 + 97 =
  19. 19.152 + 79 =
  20. 20.115 + 17 =
  21. 21.451 + 59 =
  22. 22.171 + 49 =
  23. 23.361 + 18 =
  24. 24.320 + 57 =
  25. 25.26 + 28 =
  26. 26.139 + 67 =
  27. 27.292 + 69 =
  28. 28.154 + 48 =
  29. 29.128 + 38 =
  30. 30.348 + 39 =
  31. 31.169 + 99 =
  32. 32.211 + 69 =
  33. 33.487 + 28 =
  34. 34.126 + 89 =
  35. 35.345 + 19 =
  36. 36.250 + 48 =
  37. 37.350 + 18 =
  38. 38.83 + 27 =
  39. 39.129 + 37 =
  40. 40.344 + 89 =

Answer key

  1. 207
  2. 88
  3. 439
  4. 439
  5. 503
  6. 352
  7. 265
  8. 86
  9. 506
  10. 205
  11. 508
  12. 144
  13. 443
  14. 367
  15. 526
  16. 211
  17. 557
  18. 182
  19. 231
  20. 132
  21. 510
  22. 220
  23. 379
  24. 377
  25. 54
  26. 206
  27. 361
  28. 202
  29. 166
  30. 387
  31. 268
  32. 280
  33. 515
  34. 215
  35. 364
  36. 298
  37. 368
  38. 110
  39. 166
  40. 433

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