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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 497 · 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. 1.84 + 47 =
  2. 2.299 + 17 =
  3. 3.186 + 69 =
  4. 4.354 + 47 =
  5. 5.128 + 48 =
  6. 6.415 + 17 =
  7. 7.29 + 98 =
  8. 8.432 + 29 =
  9. 9.57 + 99 =
  10. 10.94 + 17 =
  11. 11.259 + 37 =
  12. 12.186 + 99 =
  13. 13.381 + 78 =
  14. 14.35 + 39 =
  15. 15.352 + 79 =
  16. 16.87 + 39 =
  17. 17.230 + 19 =
  18. 18.334 + 47 =
  19. 19.128 + 88 =
  20. 20.162 + 28 =
  21. 21.141 + 59 =
  22. 22.240 + 89 =
  23. 23.272 + 28 =
  24. 24.212 + 89 =
  25. 25.285 + 88 =
  26. 26.359 + 17 =
  27. 27.183 + 59 =
  28. 28.270 + 58 =
  29. 29.287 + 17 =
  30. 30.128 + 17 =
  31. 31.242 + 48 =
  32. 32.462 + 37 =
  33. 33.494 + 97 =
  34. 34.451 + 98 =
  35. 35.44 + 57 =
  36. 36.189 + 37 =
  37. 37.90 + 98 =
  38. 38.117 + 69 =
  39. 39.343 + 98 =
  40. 40.208 + 77 =

Answer key

  1. 131
  2. 316
  3. 255
  4. 401
  5. 176
  6. 432
  7. 127
  8. 461
  9. 156
  10. 111
  11. 296
  12. 285
  13. 459
  14. 74
  15. 431
  16. 126
  17. 249
  18. 381
  19. 216
  20. 190
  21. 200
  22. 329
  23. 300
  24. 301
  25. 373
  26. 376
  27. 242
  28. 328
  29. 304
  30. 145
  31. 290
  32. 499
  33. 591
  34. 549
  35. 101
  36. 226
  37. 188
  38. 186
  39. 441
  40. 285

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