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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 363 · 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. 1.134 + 37 =
  2. 2.190 + 27 =
  3. 3.441 + 37 =
  4. 4.372 + 39 =
  5. 5.384 + 68 =
  6. 6.223 + 37 =
  7. 7.66 + 77 =
  8. 8.321 + 38 =
  9. 9.272 + 18 =
  10. 10.185 + 37 =
  11. 11.179 + 29 =
  12. 12.214 + 89 =
  13. 13.310 + 67 =
  14. 14.280 + 99 =
  15. 15.277 + 87 =
  16. 16.58 + 78 =
  17. 17.499 + 29 =
  18. 18.405 + 98 =
  19. 19.26 + 58 =
  20. 20.317 + 27 =
  21. 21.164 + 87 =
  22. 22.204 + 19 =
  23. 23.162 + 29 =
  24. 24.141 + 37 =
  25. 25.384 + 27 =
  26. 26.468 + 89 =
  27. 27.287 + 17 =
  28. 28.152 + 39 =
  29. 29.96 + 78 =
  30. 30.146 + 28 =
  31. 31.191 + 39 =
  32. 32.365 + 68 =
  33. 33.99 + 17 =
  34. 34.394 + 27 =
  35. 35.331 + 47 =
  36. 36.126 + 27 =
  37. 37.130 + 58 =
  38. 38.256 + 27 =
  39. 39.159 + 68 =
  40. 40.254 + 47 =

Answer key

  1. 171
  2. 217
  3. 478
  4. 411
  5. 452
  6. 260
  7. 143
  8. 359
  9. 290
  10. 222
  11. 208
  12. 303
  13. 377
  14. 379
  15. 364
  16. 136
  17. 528
  18. 503
  19. 84
  20. 344
  21. 251
  22. 223
  23. 191
  24. 178
  25. 411
  26. 557
  27. 304
  28. 191
  29. 174
  30. 174
  31. 230
  32. 433
  33. 116
  34. 421
  35. 378
  36. 153
  37. 188
  38. 283
  39. 227
  40. 301

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