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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 301 · 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. 1.240 + 59 =
  2. 2.197 + 18 =
  3. 3.157 + 89 =
  4. 4.72 + 28 =
  5. 5.213 + 49 =
  6. 6.65 + 68 =
  7. 7.262 + 28 =
  8. 8.31 + 59 =
  9. 9.340 + 88 =
  10. 10.317 + 28 =
  11. 11.481 + 78 =
  12. 12.97 + 49 =
  13. 13.274 + 37 =
  14. 14.222 + 29 =
  15. 15.371 + 99 =
  16. 16.417 + 87 =
  17. 17.249 + 97 =
  18. 18.333 + 57 =
  19. 19.48 + 17 =
  20. 20.288 + 37 =
  21. 21.240 + 29 =
  22. 22.165 + 79 =
  23. 23.218 + 99 =
  24. 24.78 + 48 =
  25. 25.314 + 18 =
  26. 26.413 + 77 =
  27. 27.258 + 79 =
  28. 28.237 + 58 =
  29. 29.71 + 77 =
  30. 30.399 + 27 =
  31. 31.284 + 47 =
  32. 32.223 + 89 =
  33. 33.406 + 17 =
  34. 34.26 + 79 =
  35. 35.319 + 77 =
  36. 36.471 + 58 =
  37. 37.200 + 27 =
  38. 38.196 + 68 =
  39. 39.279 + 68 =
  40. 40.399 + 18 =

Answer key

  1. 299
  2. 215
  3. 246
  4. 100
  5. 262
  6. 133
  7. 290
  8. 90
  9. 428
  10. 345
  11. 559
  12. 146
  13. 311
  14. 251
  15. 470
  16. 504
  17. 346
  18. 390
  19. 65
  20. 325
  21. 269
  22. 244
  23. 317
  24. 126
  25. 332
  26. 490
  27. 337
  28. 295
  29. 148
  30. 426
  31. 331
  32. 312
  33. 423
  34. 105
  35. 396
  36. 529
  37. 227
  38. 264
  39. 347
  40. 417

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