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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 590 · 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. 1.212 + 87 =
  2. 2.161 + 28 =
  3. 3.166 + 97 =
  4. 4.88 + 29 =
  5. 5.251 + 69 =
  6. 6.390 + 38 =
  7. 7.261 + 87 =
  8. 8.55 + 17 =
  9. 9.63 + 77 =
  10. 10.178 + 97 =
  11. 11.145 + 19 =
  12. 12.117 + 19 =
  13. 13.451 + 87 =
  14. 14.171 + 58 =
  15. 15.463 + 87 =
  16. 16.443 + 38 =
  17. 17.175 + 98 =
  18. 18.335 + 17 =
  19. 19.257 + 27 =
  20. 20.211 + 98 =
  21. 21.98 + 49 =
  22. 22.219 + 89 =
  23. 23.51 + 77 =
  24. 24.171 + 59 =
  25. 25.29 + 29 =
  26. 26.26 + 99 =
  27. 27.491 + 47 =
  28. 28.115 + 18 =
  29. 29.323 + 77 =
  30. 30.268 + 49 =
  31. 31.287 + 27 =
  32. 32.240 + 59 =
  33. 33.183 + 97 =
  34. 34.228 + 48 =
  35. 35.97 + 38 =
  36. 36.191 + 77 =
  37. 37.227 + 88 =
  38. 38.84 + 67 =
  39. 39.53 + 29 =
  40. 40.430 + 88 =

Answer key

  1. 299
  2. 189
  3. 263
  4. 117
  5. 320
  6. 428
  7. 348
  8. 72
  9. 140
  10. 275
  11. 164
  12. 136
  13. 538
  14. 229
  15. 550
  16. 481
  17. 273
  18. 352
  19. 284
  20. 309
  21. 147
  22. 308
  23. 128
  24. 230
  25. 58
  26. 125
  27. 538
  28. 133
  29. 400
  30. 317
  31. 314
  32. 299
  33. 280
  34. 276
  35. 135
  36. 268
  37. 315
  38. 151
  39. 82
  40. 518

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