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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 139 · 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. 1.398 + 27 =
  2. 2.430 + 89 =
  3. 3.355 + 78 =
  4. 4.247 + 29 =
  5. 5.96 + 87 =
  6. 6.409 + 67 =
  7. 7.200 + 19 =
  8. 8.301 + 68 =
  9. 9.373 + 38 =
  10. 10.142 + 69 =
  11. 11.343 + 19 =
  12. 12.111 + 59 =
  13. 13.390 + 17 =
  14. 14.88 + 38 =
  15. 15.369 + 59 =
  16. 16.124 + 38 =
  17. 17.42 + 48 =
  18. 18.211 + 37 =
  19. 19.454 + 69 =
  20. 20.390 + 29 =
  21. 21.121 + 38 =
  22. 22.411 + 48 =
  23. 23.104 + 89 =
  24. 24.413 + 47 =
  25. 25.161 + 97 =
  26. 26.240 + 18 =
  27. 27.136 + 57 =
  28. 28.452 + 87 =
  29. 29.334 + 17 =
  30. 30.66 + 58 =
  31. 31.457 + 47 =
  32. 32.420 + 88 =
  33. 33.295 + 17 =
  34. 34.107 + 68 =
  35. 35.431 + 67 =
  36. 36.190 + 67 =
  37. 37.362 + 68 =
  38. 38.363 + 87 =
  39. 39.231 + 38 =
  40. 40.31 + 58 =

Answer key

  1. 425
  2. 519
  3. 433
  4. 276
  5. 183
  6. 476
  7. 219
  8. 369
  9. 411
  10. 211
  11. 362
  12. 170
  13. 407
  14. 126
  15. 428
  16. 162
  17. 90
  18. 248
  19. 523
  20. 419
  21. 159
  22. 459
  23. 193
  24. 460
  25. 258
  26. 258
  27. 193
  28. 539
  29. 351
  30. 124
  31. 504
  32. 508
  33. 312
  34. 175
  35. 498
  36. 257
  37. 430
  38. 450
  39. 269
  40. 89

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