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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 44 · 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. 1.329 + 37 =
  2. 2.159 + 99 =
  3. 3.229 + 47 =
  4. 4.457 + 59 =
  5. 5.337 + 87 =
  6. 6.315 + 27 =
  7. 7.497 + 27 =
  8. 8.406 + 57 =
  9. 9.466 + 67 =
  10. 10.412 + 29 =
  11. 11.91 + 29 =
  12. 12.374 + 59 =
  13. 13.266 + 37 =
  14. 14.193 + 99 =
  15. 15.58 + 87 =
  16. 16.407 + 97 =
  17. 17.418 + 38 =
  18. 18.354 + 28 =
  19. 19.282 + 98 =
  20. 20.474 + 99 =
  21. 21.402 + 18 =
  22. 22.116 + 37 =
  23. 23.448 + 59 =
  24. 24.373 + 17 =
  25. 25.104 + 19 =
  26. 26.85 + 98 =
  27. 27.273 + 68 =
  28. 28.438 + 19 =
  29. 29.368 + 58 =
  30. 30.187 + 48 =
  31. 31.372 + 29 =
  32. 32.415 + 79 =
  33. 33.480 + 77 =
  34. 34.478 + 78 =
  35. 35.373 + 28 =
  36. 36.34 + 98 =
  37. 37.453 + 37 =
  38. 38.297 + 67 =
  39. 39.218 + 77 =
  40. 40.186 + 57 =

Answer key

  1. 366
  2. 258
  3. 276
  4. 516
  5. 424
  6. 342
  7. 524
  8. 463
  9. 533
  10. 441
  11. 120
  12. 433
  13. 303
  14. 292
  15. 145
  16. 504
  17. 456
  18. 382
  19. 380
  20. 573
  21. 420
  22. 153
  23. 507
  24. 390
  25. 123
  26. 183
  27. 341
  28. 457
  29. 426
  30. 235
  31. 401
  32. 494
  33. 557
  34. 556
  35. 401
  36. 132
  37. 490
  38. 364
  39. 295
  40. 243

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