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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 176 · 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. 1.452 + 57 =
  2. 2.443 + 67 =
  3. 3.140 + 37 =
  4. 4.218 + 17 =
  5. 5.105 + 59 =
  6. 6.169 + 27 =
  7. 7.378 + 67 =
  8. 8.93 + 48 =
  9. 9.488 + 89 =
  10. 10.181 + 49 =
  11. 11.420 + 98 =
  12. 12.135 + 89 =
  13. 13.364 + 28 =
  14. 14.212 + 57 =
  15. 15.145 + 27 =
  16. 16.367 + 78 =
  17. 17.386 + 88 =
  18. 18.375 + 19 =
  19. 19.427 + 18 =
  20. 20.124 + 18 =
  21. 21.394 + 79 =
  22. 22.122 + 38 =
  23. 23.310 + 99 =
  24. 24.165 + 77 =
  25. 25.192 + 89 =
  26. 26.92 + 19 =
  27. 27.334 + 37 =
  28. 28.113 + 38 =
  29. 29.72 + 49 =
  30. 30.64 + 28 =
  31. 31.78 + 18 =
  32. 32.403 + 19 =
  33. 33.141 + 29 =
  34. 34.333 + 69 =
  35. 35.421 + 68 =
  36. 36.151 + 18 =
  37. 37.288 + 79 =
  38. 38.425 + 59 =
  39. 39.222 + 27 =
  40. 40.281 + 99 =

Answer key

  1. 509
  2. 510
  3. 177
  4. 235
  5. 164
  6. 196
  7. 445
  8. 141
  9. 577
  10. 230
  11. 518
  12. 224
  13. 392
  14. 269
  15. 172
  16. 445
  17. 474
  18. 394
  19. 445
  20. 142
  21. 473
  22. 160
  23. 409
  24. 242
  25. 281
  26. 111
  27. 371
  28. 151
  29. 121
  30. 92
  31. 96
  32. 422
  33. 170
  34. 402
  35. 489
  36. 169
  37. 367
  38. 484
  39. 249
  40. 380

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