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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 701 · 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. 1.230 + 97 =
  2. 2.136 + 37 =
  3. 3.87 + 49 =
  4. 4.175 + 97 =
  5. 5.185 + 37 =
  6. 6.233 + 27 =
  7. 7.61 + 78 =
  8. 8.374 + 59 =
  9. 9.280 + 18 =
  10. 10.235 + 48 =
  11. 11.279 + 27 =
  12. 12.302 + 48 =
  13. 13.56 + 18 =
  14. 14.214 + 88 =
  15. 15.129 + 39 =
  16. 16.43 + 97 =
  17. 17.276 + 99 =
  18. 18.241 + 29 =
  19. 19.278 + 17 =
  20. 20.432 + 97 =
  21. 21.386 + 38 =
  22. 22.428 + 27 =
  23. 23.216 + 27 =
  24. 24.112 + 28 =
  25. 25.127 + 27 =
  26. 26.439 + 69 =
  27. 27.110 + 39 =
  28. 28.70 + 48 =
  29. 29.324 + 69 =
  30. 30.347 + 89 =
  31. 31.286 + 77 =
  32. 32.45 + 27 =
  33. 33.102 + 38 =
  34. 34.119 + 69 =
  35. 35.398 + 29 =
  36. 36.307 + 27 =
  37. 37.101 + 98 =
  38. 38.52 + 37 =
  39. 39.85 + 99 =
  40. 40.84 + 27 =

Answer key

  1. 327
  2. 173
  3. 136
  4. 272
  5. 222
  6. 260
  7. 139
  8. 433
  9. 298
  10. 283
  11. 306
  12. 350
  13. 74
  14. 302
  15. 168
  16. 140
  17. 375
  18. 270
  19. 295
  20. 529
  21. 424
  22. 455
  23. 243
  24. 140
  25. 154
  26. 508
  27. 149
  28. 118
  29. 393
  30. 436
  31. 363
  32. 72
  33. 140
  34. 188
  35. 427
  36. 334
  37. 199
  38. 89
  39. 184
  40. 111

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