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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 396 · 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. 1.119 + 59 =
  2. 2.168 + 97 =
  3. 3.495 + 58 =
  4. 4.206 + 99 =
  5. 5.197 + 77 =
  6. 6.50 + 39 =
  7. 7.262 + 87 =
  8. 8.473 + 97 =
  9. 9.350 + 49 =
  10. 10.272 + 79 =
  11. 11.388 + 79 =
  12. 12.324 + 17 =
  13. 13.136 + 49 =
  14. 14.368 + 38 =
  15. 15.476 + 27 =
  16. 16.384 + 68 =
  17. 17.180 + 77 =
  18. 18.130 + 28 =
  19. 19.369 + 48 =
  20. 20.164 + 28 =
  21. 21.110 + 19 =
  22. 22.432 + 37 =
  23. 23.301 + 68 =
  24. 24.261 + 37 =
  25. 25.218 + 47 =
  26. 26.442 + 79 =
  27. 27.386 + 77 =
  28. 28.175 + 79 =
  29. 29.76 + 97 =
  30. 30.321 + 57 =
  31. 31.216 + 77 =
  32. 32.69 + 37 =
  33. 33.120 + 57 =
  34. 34.215 + 38 =
  35. 35.331 + 57 =
  36. 36.132 + 78 =
  37. 37.116 + 19 =
  38. 38.46 + 69 =
  39. 39.200 + 59 =
  40. 40.189 + 28 =

Answer key

  1. 178
  2. 265
  3. 553
  4. 305
  5. 274
  6. 89
  7. 349
  8. 570
  9. 399
  10. 351
  11. 467
  12. 341
  13. 185
  14. 406
  15. 503
  16. 452
  17. 257
  18. 158
  19. 417
  20. 192
  21. 129
  22. 469
  23. 369
  24. 298
  25. 265
  26. 521
  27. 463
  28. 254
  29. 173
  30. 378
  31. 293
  32. 106
  33. 177
  34. 253
  35. 388
  36. 210
  37. 135
  38. 115
  39. 259
  40. 217

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