← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 286 · 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. 1.258 + 49 =
  2. 2.326 + 88 =
  3. 3.123 + 87 =
  4. 4.300 + 39 =
  5. 5.484 + 88 =
  6. 6.497 + 29 =
  7. 7.64 + 69 =
  8. 8.155 + 29 =
  9. 9.268 + 78 =
  10. 10.90 + 47 =
  11. 11.453 + 39 =
  12. 12.64 + 27 =
  13. 13.244 + 27 =
  14. 14.136 + 17 =
  15. 15.340 + 37 =
  16. 16.27 + 77 =
  17. 17.350 + 48 =
  18. 18.436 + 38 =
  19. 19.366 + 38 =
  20. 20.304 + 19 =
  21. 21.189 + 38 =
  22. 22.128 + 98 =
  23. 23.34 + 48 =
  24. 24.116 + 87 =
  25. 25.365 + 18 =
  26. 26.352 + 68 =
  27. 27.317 + 48 =
  28. 28.256 + 77 =
  29. 29.369 + 99 =
  30. 30.296 + 47 =
  31. 31.75 + 68 =
  32. 32.337 + 18 =
  33. 33.359 + 29 =
  34. 34.34 + 97 =
  35. 35.343 + 37 =
  36. 36.205 + 29 =
  37. 37.247 + 47 =
  38. 38.261 + 27 =
  39. 39.395 + 58 =
  40. 40.309 + 57 =

Answer key

  1. 307
  2. 414
  3. 210
  4. 339
  5. 572
  6. 526
  7. 133
  8. 184
  9. 346
  10. 137
  11. 492
  12. 91
  13. 271
  14. 153
  15. 377
  16. 104
  17. 398
  18. 474
  19. 404
  20. 323
  21. 227
  22. 226
  23. 82
  24. 203
  25. 383
  26. 420
  27. 365
  28. 333
  29. 468
  30. 343
  31. 143
  32. 355
  33. 388
  34. 131
  35. 380
  36. 234
  37. 294
  38. 288
  39. 453
  40. 366

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths