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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 171 · 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. 1.431 + 88 =
  2. 2.49 + 59 =
  3. 3.136 + 47 =
  4. 4.276 + 98 =
  5. 5.416 + 48 =
  6. 6.35 + 37 =
  7. 7.199 + 89 =
  8. 8.207 + 68 =
  9. 9.212 + 67 =
  10. 10.436 + 89 =
  11. 11.250 + 48 =
  12. 12.188 + 99 =
  13. 13.43 + 87 =
  14. 14.379 + 17 =
  15. 15.376 + 39 =
  16. 16.364 + 77 =
  17. 17.343 + 67 =
  18. 18.406 + 29 =
  19. 19.135 + 88 =
  20. 20.336 + 67 =
  21. 21.160 + 88 =
  22. 22.106 + 77 =
  23. 23.361 + 47 =
  24. 24.296 + 29 =
  25. 25.250 + 27 =
  26. 26.178 + 39 =
  27. 27.174 + 47 =
  28. 28.127 + 78 =
  29. 29.50 + 78 =
  30. 30.112 + 67 =
  31. 31.161 + 88 =
  32. 32.457 + 19 =
  33. 33.483 + 97 =
  34. 34.74 + 17 =
  35. 35.176 + 27 =
  36. 36.128 + 18 =
  37. 37.243 + 67 =
  38. 38.104 + 77 =
  39. 39.158 + 97 =
  40. 40.119 + 99 =

Answer key

  1. 519
  2. 108
  3. 183
  4. 374
  5. 464
  6. 72
  7. 288
  8. 275
  9. 279
  10. 525
  11. 298
  12. 287
  13. 130
  14. 396
  15. 415
  16. 441
  17. 410
  18. 435
  19. 223
  20. 403
  21. 248
  22. 183
  23. 408
  24. 325
  25. 277
  26. 217
  27. 221
  28. 205
  29. 128
  30. 179
  31. 249
  32. 476
  33. 580
  34. 91
  35. 203
  36. 146
  37. 310
  38. 181
  39. 255
  40. 218

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