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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 623 · 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. 1.236 + 58 =
  2. 2.265 + 78 =
  3. 3.76 + 18 =
  4. 4.490 + 89 =
  5. 5.415 + 99 =
  6. 6.454 + 78 =
  7. 7.435 + 69 =
  8. 8.132 + 28 =
  9. 9.27 + 67 =
  10. 10.242 + 97 =
  11. 11.35 + 38 =
  12. 12.334 + 28 =
  13. 13.350 + 29 =
  14. 14.341 + 98 =
  15. 15.477 + 78 =
  16. 16.237 + 37 =
  17. 17.151 + 89 =
  18. 18.88 + 39 =
  19. 19.176 + 68 =
  20. 20.234 + 99 =
  21. 21.138 + 98 =
  22. 22.301 + 49 =
  23. 23.264 + 17 =
  24. 24.328 + 38 =
  25. 25.184 + 57 =
  26. 26.300 + 89 =
  27. 27.174 + 39 =
  28. 28.52 + 38 =
  29. 29.248 + 49 =
  30. 30.161 + 18 =
  31. 31.25 + 47 =
  32. 32.230 + 28 =
  33. 33.279 + 79 =
  34. 34.394 + 88 =
  35. 35.314 + 68 =
  36. 36.211 + 99 =
  37. 37.177 + 39 =
  38. 38.53 + 67 =
  39. 39.412 + 29 =
  40. 40.30 + 17 =

Answer key

  1. 294
  2. 343
  3. 94
  4. 579
  5. 514
  6. 532
  7. 504
  8. 160
  9. 94
  10. 339
  11. 73
  12. 362
  13. 379
  14. 439
  15. 555
  16. 274
  17. 240
  18. 127
  19. 244
  20. 333
  21. 236
  22. 350
  23. 281
  24. 366
  25. 241
  26. 389
  27. 213
  28. 90
  29. 297
  30. 179
  31. 72
  32. 258
  33. 358
  34. 482
  35. 382
  36. 310
  37. 216
  38. 120
  39. 441
  40. 47

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