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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 68 · 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. 1.338 + 59 =
  2. 2.408 + 48 =
  3. 3.458 + 27 =
  4. 4.318 + 17 =
  5. 5.362 + 68 =
  6. 6.230 + 77 =
  7. 7.182 + 79 =
  8. 8.107 + 88 =
  9. 9.235 + 97 =
  10. 10.357 + 28 =
  11. 11.293 + 67 =
  12. 12.144 + 29 =
  13. 13.29 + 39 =
  14. 14.405 + 69 =
  15. 15.414 + 29 =
  16. 16.93 + 58 =
  17. 17.364 + 59 =
  18. 18.130 + 89 =
  19. 19.408 + 17 =
  20. 20.481 + 47 =
  21. 21.395 + 17 =
  22. 22.496 + 19 =
  23. 23.195 + 29 =
  24. 24.114 + 57 =
  25. 25.58 + 77 =
  26. 26.169 + 88 =
  27. 27.84 + 88 =
  28. 28.432 + 47 =
  29. 29.84 + 27 =
  30. 30.236 + 17 =
  31. 31.95 + 89 =
  32. 32.194 + 57 =
  33. 33.58 + 38 =
  34. 34.246 + 67 =
  35. 35.338 + 29 =
  36. 36.221 + 39 =
  37. 37.250 + 99 =
  38. 38.422 + 38 =
  39. 39.127 + 49 =
  40. 40.333 + 38 =

Answer key

  1. 397
  2. 456
  3. 485
  4. 335
  5. 430
  6. 307
  7. 261
  8. 195
  9. 332
  10. 385
  11. 360
  12. 173
  13. 68
  14. 474
  15. 443
  16. 151
  17. 423
  18. 219
  19. 425
  20. 528
  21. 412
  22. 515
  23. 224
  24. 171
  25. 135
  26. 257
  27. 172
  28. 479
  29. 111
  30. 253
  31. 184
  32. 251
  33. 96
  34. 313
  35. 367
  36. 260
  37. 349
  38. 460
  39. 176
  40. 371

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