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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 509 · 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. 1.31 + 77 =
  2. 2.429 + 57 =
  3. 3.414 + 19 =
  4. 4.282 + 87 =
  5. 5.210 + 49 =
  6. 6.154 + 37 =
  7. 7.229 + 69 =
  8. 8.193 + 58 =
  9. 9.237 + 69 =
  10. 10.178 + 38 =
  11. 11.105 + 37 =
  12. 12.243 + 68 =
  13. 13.387 + 19 =
  14. 14.185 + 37 =
  15. 15.269 + 89 =
  16. 16.210 + 37 =
  17. 17.183 + 48 =
  18. 18.130 + 37 =
  19. 19.344 + 67 =
  20. 20.316 + 57 =
  21. 21.149 + 47 =
  22. 22.330 + 17 =
  23. 23.437 + 69 =
  24. 24.340 + 88 =
  25. 25.139 + 88 =
  26. 26.463 + 87 =
  27. 27.358 + 67 =
  28. 28.234 + 67 =
  29. 29.76 + 78 =
  30. 30.287 + 78 =
  31. 31.137 + 17 =
  32. 32.96 + 29 =
  33. 33.294 + 38 =
  34. 34.399 + 37 =
  35. 35.214 + 98 =
  36. 36.369 + 27 =
  37. 37.449 + 27 =
  38. 38.223 + 69 =
  39. 39.71 + 67 =
  40. 40.487 + 59 =

Answer key

  1. 108
  2. 486
  3. 433
  4. 369
  5. 259
  6. 191
  7. 298
  8. 251
  9. 306
  10. 216
  11. 142
  12. 311
  13. 406
  14. 222
  15. 358
  16. 247
  17. 231
  18. 167
  19. 411
  20. 373
  21. 196
  22. 347
  23. 506
  24. 428
  25. 227
  26. 550
  27. 425
  28. 301
  29. 154
  30. 365
  31. 154
  32. 125
  33. 332
  34. 436
  35. 312
  36. 396
  37. 476
  38. 292
  39. 138
  40. 546

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