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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 448 · 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. 1.367 + 28 =
  2. 2.376 + 27 =
  3. 3.185 + 17 =
  4. 4.219 + 27 =
  5. 5.322 + 37 =
  6. 6.285 + 37 =
  7. 7.401 + 98 =
  8. 8.89 + 79 =
  9. 9.301 + 78 =
  10. 10.301 + 78 =
  11. 11.103 + 98 =
  12. 12.132 + 79 =
  13. 13.281 + 38 =
  14. 14.405 + 67 =
  15. 15.158 + 37 =
  16. 16.82 + 47 =
  17. 17.80 + 77 =
  18. 18.110 + 59 =
  19. 19.291 + 99 =
  20. 20.217 + 68 =
  21. 21.337 + 38 =
  22. 22.115 + 97 =
  23. 23.413 + 37 =
  24. 24.86 + 18 =
  25. 25.281 + 77 =
  26. 26.314 + 17 =
  27. 27.60 + 18 =
  28. 28.437 + 37 =
  29. 29.143 + 67 =
  30. 30.156 + 78 =
  31. 31.230 + 57 =
  32. 32.199 + 57 =
  33. 33.57 + 19 =
  34. 34.99 + 47 =
  35. 35.99 + 97 =
  36. 36.471 + 29 =
  37. 37.132 + 99 =
  38. 38.302 + 49 =
  39. 39.100 + 69 =
  40. 40.367 + 77 =

Answer key

  1. 395
  2. 403
  3. 202
  4. 246
  5. 359
  6. 322
  7. 499
  8. 168
  9. 379
  10. 379
  11. 201
  12. 211
  13. 319
  14. 472
  15. 195
  16. 129
  17. 157
  18. 169
  19. 390
  20. 285
  21. 375
  22. 212
  23. 450
  24. 104
  25. 358
  26. 331
  27. 78
  28. 474
  29. 210
  30. 234
  31. 287
  32. 256
  33. 76
  34. 146
  35. 196
  36. 500
  37. 231
  38. 351
  39. 169
  40. 444

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