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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 884 · 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. 1.323 + 37 =
  2. 2.197 + 19 =
  3. 3.193 + 98 =
  4. 4.119 + 98 =
  5. 5.176 + 17 =
  6. 6.126 + 79 =
  7. 7.275 + 48 =
  8. 8.155 + 97 =
  9. 9.407 + 38 =
  10. 10.190 + 78 =
  11. 11.383 + 88 =
  12. 12.205 + 97 =
  13. 13.116 + 59 =
  14. 14.106 + 87 =
  15. 15.145 + 98 =
  16. 16.437 + 18 =
  17. 17.462 + 59 =
  18. 18.409 + 47 =
  19. 19.105 + 17 =
  20. 20.27 + 97 =
  21. 21.370 + 27 =
  22. 22.359 + 19 =
  23. 23.214 + 97 =
  24. 24.149 + 28 =
  25. 25.311 + 57 =
  26. 26.121 + 19 =
  27. 27.196 + 79 =
  28. 28.236 + 39 =
  29. 29.51 + 37 =
  30. 30.107 + 77 =
  31. 31.396 + 18 =
  32. 32.203 + 39 =
  33. 33.129 + 47 =
  34. 34.390 + 77 =
  35. 35.83 + 37 =
  36. 36.322 + 87 =
  37. 37.171 + 59 =
  38. 38.368 + 87 =
  39. 39.64 + 39 =
  40. 40.395 + 88 =

Answer key

  1. 360
  2. 216
  3. 291
  4. 217
  5. 193
  6. 205
  7. 323
  8. 252
  9. 445
  10. 268
  11. 471
  12. 302
  13. 175
  14. 193
  15. 243
  16. 455
  17. 521
  18. 456
  19. 122
  20. 124
  21. 397
  22. 378
  23. 311
  24. 177
  25. 368
  26. 140
  27. 275
  28. 275
  29. 88
  30. 184
  31. 414
  32. 242
  33. 176
  34. 467
  35. 120
  36. 409
  37. 230
  38. 455
  39. 103
  40. 483

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