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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 183 · 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. 1.496 + 99 =
  2. 2.267 + 28 =
  3. 3.462 + 28 =
  4. 4.186 + 38 =
  5. 5.471 + 99 =
  6. 6.381 + 39 =
  7. 7.258 + 29 =
  8. 8.52 + 99 =
  9. 9.444 + 69 =
  10. 10.152 + 87 =
  11. 11.129 + 19 =
  12. 12.188 + 47 =
  13. 13.442 + 77 =
  14. 14.225 + 67 =
  15. 15.89 + 47 =
  16. 16.235 + 37 =
  17. 17.309 + 49 =
  18. 18.199 + 57 =
  19. 19.463 + 19 =
  20. 20.262 + 57 =
  21. 21.498 + 77 =
  22. 22.413 + 69 =
  23. 23.91 + 57 =
  24. 24.295 + 19 =
  25. 25.335 + 28 =
  26. 26.114 + 27 =
  27. 27.160 + 59 =
  28. 28.28 + 79 =
  29. 29.307 + 69 =
  30. 30.77 + 78 =
  31. 31.200 + 97 =
  32. 32.87 + 99 =
  33. 33.138 + 47 =
  34. 34.69 + 57 =
  35. 35.242 + 29 =
  36. 36.361 + 28 =
  37. 37.303 + 47 =
  38. 38.359 + 39 =
  39. 39.81 + 39 =
  40. 40.106 + 67 =

Answer key

  1. 595
  2. 295
  3. 490
  4. 224
  5. 570
  6. 420
  7. 287
  8. 151
  9. 513
  10. 239
  11. 148
  12. 235
  13. 519
  14. 292
  15. 136
  16. 272
  17. 358
  18. 256
  19. 482
  20. 319
  21. 575
  22. 482
  23. 148
  24. 314
  25. 363
  26. 141
  27. 219
  28. 107
  29. 376
  30. 155
  31. 297
  32. 186
  33. 185
  34. 126
  35. 271
  36. 389
  37. 350
  38. 398
  39. 120
  40. 173

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