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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 351 · 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. 1.359 + 29 =
  2. 2.255 + 68 =
  3. 3.439 + 47 =
  4. 4.93 + 58 =
  5. 5.354 + 28 =
  6. 6.233 + 17 =
  7. 7.49 + 27 =
  8. 8.85 + 67 =
  9. 9.371 + 18 =
  10. 10.137 + 37 =
  11. 11.256 + 29 =
  12. 12.364 + 27 =
  13. 13.138 + 39 =
  14. 14.101 + 98 =
  15. 15.405 + 19 =
  16. 16.115 + 78 =
  17. 17.248 + 48 =
  18. 18.75 + 78 =
  19. 19.130 + 77 =
  20. 20.112 + 18 =
  21. 21.227 + 37 =
  22. 22.312 + 69 =
  23. 23.99 + 88 =
  24. 24.399 + 87 =
  25. 25.109 + 17 =
  26. 26.109 + 88 =
  27. 27.89 + 27 =
  28. 28.423 + 49 =
  29. 29.75 + 57 =
  30. 30.243 + 79 =
  31. 31.184 + 49 =
  32. 32.267 + 68 =
  33. 33.131 + 99 =
  34. 34.337 + 38 =
  35. 35.225 + 77 =
  36. 36.123 + 77 =
  37. 37.234 + 48 =
  38. 38.421 + 29 =
  39. 39.238 + 89 =
  40. 40.281 + 87 =

Answer key

  1. 388
  2. 323
  3. 486
  4. 151
  5. 382
  6. 250
  7. 76
  8. 152
  9. 389
  10. 174
  11. 285
  12. 391
  13. 177
  14. 199
  15. 424
  16. 193
  17. 296
  18. 153
  19. 207
  20. 130
  21. 264
  22. 381
  23. 187
  24. 486
  25. 126
  26. 197
  27. 116
  28. 472
  29. 132
  30. 322
  31. 233
  32. 335
  33. 230
  34. 375
  35. 302
  36. 200
  37. 282
  38. 450
  39. 327
  40. 368

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