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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 258 · 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. 1.291 + 97 =
  2. 2.173 + 28 =
  3. 3.264 + 28 =
  4. 4.454 + 57 =
  5. 5.301 + 48 =
  6. 6.264 + 89 =
  7. 7.184 + 38 =
  8. 8.261 + 79 =
  9. 9.189 + 48 =
  10. 10.117 + 37 =
  11. 11.253 + 99 =
  12. 12.108 + 18 =
  13. 13.241 + 89 =
  14. 14.270 + 18 =
  15. 15.156 + 88 =
  16. 16.197 + 47 =
  17. 17.322 + 88 =
  18. 18.321 + 58 =
  19. 19.456 + 79 =
  20. 20.117 + 87 =
  21. 21.81 + 38 =
  22. 22.303 + 58 =
  23. 23.481 + 97 =
  24. 24.68 + 89 =
  25. 25.246 + 68 =
  26. 26.347 + 39 =
  27. 27.283 + 27 =
  28. 28.495 + 77 =
  29. 29.354 + 79 =
  30. 30.458 + 38 =
  31. 31.314 + 17 =
  32. 32.238 + 47 =
  33. 33.341 + 79 =
  34. 34.32 + 99 =
  35. 35.126 + 69 =
  36. 36.462 + 68 =
  37. 37.377 + 28 =
  38. 38.304 + 97 =
  39. 39.382 + 78 =
  40. 40.93 + 38 =

Answer key

  1. 388
  2. 201
  3. 292
  4. 511
  5. 349
  6. 353
  7. 222
  8. 340
  9. 237
  10. 154
  11. 352
  12. 126
  13. 330
  14. 288
  15. 244
  16. 244
  17. 410
  18. 379
  19. 535
  20. 204
  21. 119
  22. 361
  23. 578
  24. 157
  25. 314
  26. 386
  27. 310
  28. 572
  29. 433
  30. 496
  31. 331
  32. 285
  33. 420
  34. 131
  35. 195
  36. 530
  37. 405
  38. 401
  39. 460
  40. 131

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