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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 132 · 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. 1.243 + 29 =
  2. 2.96 + 17 =
  3. 3.36 + 69 =
  4. 4.329 + 37 =
  5. 5.454 + 18 =
  6. 6.131 + 78 =
  7. 7.229 + 77 =
  8. 8.238 + 38 =
  9. 9.351 + 88 =
  10. 10.154 + 77 =
  11. 11.363 + 17 =
  12. 12.205 + 47 =
  13. 13.40 + 87 =
  14. 14.25 + 47 =
  15. 15.385 + 27 =
  16. 16.193 + 58 =
  17. 17.385 + 58 =
  18. 18.307 + 28 =
  19. 19.459 + 99 =
  20. 20.475 + 68 =
  21. 21.125 + 89 =
  22. 22.129 + 89 =
  23. 23.71 + 69 =
  24. 24.69 + 87 =
  25. 25.30 + 78 =
  26. 26.130 + 39 =
  27. 27.89 + 97 =
  28. 28.212 + 39 =
  29. 29.138 + 98 =
  30. 30.47 + 48 =
  31. 31.455 + 98 =
  32. 32.427 + 87 =
  33. 33.124 + 39 =
  34. 34.78 + 88 =
  35. 35.59 + 98 =
  36. 36.148 + 68 =
  37. 37.429 + 38 =
  38. 38.392 + 69 =
  39. 39.232 + 77 =
  40. 40.456 + 47 =

Answer key

  1. 272
  2. 113
  3. 105
  4. 366
  5. 472
  6. 209
  7. 306
  8. 276
  9. 439
  10. 231
  11. 380
  12. 252
  13. 127
  14. 72
  15. 412
  16. 251
  17. 443
  18. 335
  19. 558
  20. 543
  21. 214
  22. 218
  23. 140
  24. 156
  25. 108
  26. 169
  27. 186
  28. 251
  29. 236
  30. 95
  31. 553
  32. 514
  33. 163
  34. 166
  35. 157
  36. 216
  37. 467
  38. 461
  39. 309
  40. 503

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