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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 395 · 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. 1.188 + 69 =
  2. 2.45 + 38 =
  3. 3.62 + 29 =
  4. 4.467 + 27 =
  5. 5.300 + 48 =
  6. 6.459 + 99 =
  7. 7.31 + 28 =
  8. 8.325 + 47 =
  9. 9.99 + 97 =
  10. 10.252 + 57 =
  11. 11.55 + 89 =
  12. 12.445 + 29 =
  13. 13.381 + 87 =
  14. 14.203 + 27 =
  15. 15.273 + 37 =
  16. 16.196 + 79 =
  17. 17.226 + 27 =
  18. 18.152 + 87 =
  19. 19.280 + 18 =
  20. 20.320 + 58 =
  21. 21.94 + 88 =
  22. 22.356 + 37 =
  23. 23.386 + 58 =
  24. 24.269 + 58 =
  25. 25.72 + 37 =
  26. 26.432 + 49 =
  27. 27.446 + 57 =
  28. 28.311 + 57 =
  29. 29.168 + 28 =
  30. 30.201 + 69 =
  31. 31.58 + 87 =
  32. 32.302 + 19 =
  33. 33.124 + 67 =
  34. 34.220 + 79 =
  35. 35.164 + 77 =
  36. 36.61 + 59 =
  37. 37.126 + 87 =
  38. 38.151 + 98 =
  39. 39.263 + 27 =
  40. 40.150 + 19 =

Answer key

  1. 257
  2. 83
  3. 91
  4. 494
  5. 348
  6. 558
  7. 59
  8. 372
  9. 196
  10. 309
  11. 144
  12. 474
  13. 468
  14. 230
  15. 310
  16. 275
  17. 253
  18. 239
  19. 298
  20. 378
  21. 182
  22. 393
  23. 444
  24. 327
  25. 109
  26. 481
  27. 503
  28. 368
  29. 196
  30. 270
  31. 145
  32. 321
  33. 191
  34. 299
  35. 241
  36. 120
  37. 213
  38. 249
  39. 290
  40. 169

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