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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 589 · 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. 1.346 + 89 =
  2. 2.238 + 37 =
  3. 3.334 + 89 =
  4. 4.305 + 88 =
  5. 5.401 + 88 =
  6. 6.172 + 47 =
  7. 7.267 + 79 =
  8. 8.65 + 78 =
  9. 9.440 + 57 =
  10. 10.49 + 48 =
  11. 11.252 + 27 =
  12. 12.31 + 57 =
  13. 13.342 + 89 =
  14. 14.336 + 78 =
  15. 15.209 + 77 =
  16. 16.315 + 88 =
  17. 17.333 + 68 =
  18. 18.442 + 18 =
  19. 19.350 + 97 =
  20. 20.450 + 17 =
  21. 21.137 + 98 =
  22. 22.189 + 89 =
  23. 23.300 + 18 =
  24. 24.306 + 17 =
  25. 25.229 + 38 =
  26. 26.122 + 39 =
  27. 27.421 + 79 =
  28. 28.346 + 17 =
  29. 29.490 + 17 =
  30. 30.138 + 39 =
  31. 31.230 + 89 =
  32. 32.121 + 48 =
  33. 33.265 + 49 =
  34. 34.357 + 97 =
  35. 35.323 + 98 =
  36. 36.488 + 97 =
  37. 37.63 + 29 =
  38. 38.374 + 57 =
  39. 39.141 + 28 =
  40. 40.85 + 39 =

Answer key

  1. 435
  2. 275
  3. 423
  4. 393
  5. 489
  6. 219
  7. 346
  8. 143
  9. 497
  10. 97
  11. 279
  12. 88
  13. 431
  14. 414
  15. 286
  16. 403
  17. 401
  18. 460
  19. 447
  20. 467
  21. 235
  22. 278
  23. 318
  24. 323
  25. 267
  26. 161
  27. 500
  28. 363
  29. 507
  30. 177
  31. 319
  32. 169
  33. 314
  34. 454
  35. 421
  36. 585
  37. 92
  38. 431
  39. 169
  40. 124

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