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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 545 · 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. 1.147 + 29 =
  2. 2.249 + 27 =
  3. 3.135 + 39 =
  4. 4.69 + 47 =
  5. 5.171 + 48 =
  6. 6.273 + 27 =
  7. 7.352 + 87 =
  8. 8.106 + 68 =
  9. 9.493 + 58 =
  10. 10.203 + 17 =
  11. 11.395 + 37 =
  12. 12.420 + 78 =
  13. 13.53 + 17 =
  14. 14.474 + 19 =
  15. 15.158 + 88 =
  16. 16.313 + 17 =
  17. 17.215 + 98 =
  18. 18.155 + 19 =
  19. 19.151 + 59 =
  20. 20.360 + 27 =
  21. 21.310 + 49 =
  22. 22.390 + 77 =
  23. 23.237 + 67 =
  24. 24.155 + 67 =
  25. 25.489 + 17 =
  26. 26.490 + 79 =
  27. 27.93 + 57 =
  28. 28.380 + 39 =
  29. 29.68 + 68 =
  30. 30.229 + 29 =
  31. 31.230 + 27 =
  32. 32.207 + 37 =
  33. 33.261 + 89 =
  34. 34.288 + 69 =
  35. 35.498 + 67 =
  36. 36.237 + 67 =
  37. 37.263 + 48 =
  38. 38.407 + 57 =
  39. 39.333 + 89 =
  40. 40.407 + 58 =

Answer key

  1. 176
  2. 276
  3. 174
  4. 116
  5. 219
  6. 300
  7. 439
  8. 174
  9. 551
  10. 220
  11. 432
  12. 498
  13. 70
  14. 493
  15. 246
  16. 330
  17. 313
  18. 174
  19. 210
  20. 387
  21. 359
  22. 467
  23. 304
  24. 222
  25. 506
  26. 569
  27. 150
  28. 419
  29. 136
  30. 258
  31. 257
  32. 244
  33. 350
  34. 357
  35. 565
  36. 304
  37. 311
  38. 464
  39. 422
  40. 465

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