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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 159 · 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. 1.129 + 27 =
  2. 2.305 + 27 =
  3. 3.258 + 69 =
  4. 4.92 + 69 =
  5. 5.197 + 59 =
  6. 6.360 + 68 =
  7. 7.101 + 19 =
  8. 8.153 + 17 =
  9. 9.454 + 17 =
  10. 10.196 + 98 =
  11. 11.227 + 29 =
  12. 12.253 + 47 =
  13. 13.475 + 18 =
  14. 14.480 + 67 =
  15. 15.72 + 19 =
  16. 16.386 + 88 =
  17. 17.47 + 57 =
  18. 18.346 + 58 =
  19. 19.88 + 37 =
  20. 20.370 + 98 =
  21. 21.218 + 97 =
  22. 22.188 + 29 =
  23. 23.466 + 97 =
  24. 24.33 + 98 =
  25. 25.220 + 28 =
  26. 26.346 + 99 =
  27. 27.172 + 99 =
  28. 28.334 + 97 =
  29. 29.98 + 29 =
  30. 30.427 + 28 =
  31. 31.99 + 98 =
  32. 32.320 + 58 =
  33. 33.226 + 37 =
  34. 34.169 + 98 =
  35. 35.464 + 67 =
  36. 36.60 + 47 =
  37. 37.438 + 68 =
  38. 38.160 + 29 =
  39. 39.261 + 78 =
  40. 40.201 + 78 =

Answer key

  1. 156
  2. 332
  3. 327
  4. 161
  5. 256
  6. 428
  7. 120
  8. 170
  9. 471
  10. 294
  11. 256
  12. 300
  13. 493
  14. 547
  15. 91
  16. 474
  17. 104
  18. 404
  19. 125
  20. 468
  21. 315
  22. 217
  23. 563
  24. 131
  25. 248
  26. 445
  27. 271
  28. 431
  29. 127
  30. 455
  31. 197
  32. 378
  33. 263
  34. 267
  35. 531
  36. 107
  37. 506
  38. 189
  39. 339
  40. 279

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