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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 452 · 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. 1.356 + 17 =
  2. 2.137 + 48 =
  3. 3.466 + 67 =
  4. 4.171 + 57 =
  5. 5.76 + 48 =
  6. 6.227 + 49 =
  7. 7.429 + 39 =
  8. 8.154 + 28 =
  9. 9.127 + 39 =
  10. 10.265 + 27 =
  11. 11.363 + 38 =
  12. 12.317 + 47 =
  13. 13.104 + 39 =
  14. 14.211 + 18 =
  15. 15.261 + 97 =
  16. 16.353 + 29 =
  17. 17.241 + 19 =
  18. 18.494 + 29 =
  19. 19.247 + 58 =
  20. 20.405 + 89 =
  21. 21.396 + 29 =
  22. 22.455 + 88 =
  23. 23.354 + 98 =
  24. 24.294 + 39 =
  25. 25.471 + 67 =
  26. 26.443 + 69 =
  27. 27.191 + 58 =
  28. 28.217 + 57 =
  29. 29.73 + 29 =
  30. 30.212 + 57 =
  31. 31.124 + 69 =
  32. 32.92 + 38 =
  33. 33.354 + 68 =
  34. 34.108 + 89 =
  35. 35.37 + 18 =
  36. 36.457 + 37 =
  37. 37.303 + 37 =
  38. 38.451 + 57 =
  39. 39.361 + 38 =
  40. 40.61 + 27 =

Answer key

  1. 373
  2. 185
  3. 533
  4. 228
  5. 124
  6. 276
  7. 468
  8. 182
  9. 166
  10. 292
  11. 401
  12. 364
  13. 143
  14. 229
  15. 358
  16. 382
  17. 260
  18. 523
  19. 305
  20. 494
  21. 425
  22. 543
  23. 452
  24. 333
  25. 538
  26. 512
  27. 249
  28. 274
  29. 102
  30. 269
  31. 193
  32. 130
  33. 422
  34. 197
  35. 55
  36. 494
  37. 340
  38. 508
  39. 399
  40. 88

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