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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 88 · 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. 1.144 + 48 =
  2. 2.409 + 59 =
  3. 3.160 + 67 =
  4. 4.262 + 57 =
  5. 5.236 + 89 =
  6. 6.408 + 28 =
  7. 7.491 + 59 =
  8. 8.37 + 97 =
  9. 9.117 + 17 =
  10. 10.496 + 58 =
  11. 11.327 + 87 =
  12. 12.161 + 27 =
  13. 13.348 + 99 =
  14. 14.497 + 57 =
  15. 15.417 + 38 =
  16. 16.278 + 87 =
  17. 17.44 + 39 =
  18. 18.217 + 28 =
  19. 19.52 + 27 =
  20. 20.148 + 29 =
  21. 21.462 + 99 =
  22. 22.151 + 68 =
  23. 23.339 + 18 =
  24. 24.476 + 77 =
  25. 25.430 + 88 =
  26. 26.236 + 97 =
  27. 27.338 + 19 =
  28. 28.295 + 98 =
  29. 29.240 + 67 =
  30. 30.33 + 37 =
  31. 31.76 + 77 =
  32. 32.197 + 78 =
  33. 33.452 + 77 =
  34. 34.190 + 27 =
  35. 35.258 + 47 =
  36. 36.157 + 69 =
  37. 37.235 + 28 =
  38. 38.236 + 79 =
  39. 39.41 + 97 =
  40. 40.465 + 69 =

Answer key

  1. 192
  2. 468
  3. 227
  4. 319
  5. 325
  6. 436
  7. 550
  8. 134
  9. 134
  10. 554
  11. 414
  12. 188
  13. 447
  14. 554
  15. 455
  16. 365
  17. 83
  18. 245
  19. 79
  20. 177
  21. 561
  22. 219
  23. 357
  24. 553
  25. 518
  26. 333
  27. 357
  28. 393
  29. 307
  30. 70
  31. 153
  32. 275
  33. 529
  34. 217
  35. 305
  36. 226
  37. 263
  38. 315
  39. 138
  40. 534

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