← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 974 · 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. 1.419 + 69 =
  2. 2.289 + 87 =
  3. 3.366 + 39 =
  4. 4.453 + 89 =
  5. 5.492 + 17 =
  6. 6.82 + 78 =
  7. 7.121 + 19 =
  8. 8.462 + 57 =
  9. 9.128 + 97 =
  10. 10.283 + 97 =
  11. 11.181 + 38 =
  12. 12.242 + 79 =
  13. 13.432 + 57 =
  14. 14.340 + 29 =
  15. 15.305 + 27 =
  16. 16.374 + 47 =
  17. 17.301 + 28 =
  18. 18.434 + 88 =
  19. 19.86 + 38 =
  20. 20.282 + 87 =
  21. 21.178 + 37 =
  22. 22.64 + 19 =
  23. 23.149 + 57 =
  24. 24.113 + 99 =
  25. 25.264 + 18 =
  26. 26.64 + 17 =
  27. 27.332 + 37 =
  28. 28.108 + 88 =
  29. 29.109 + 58 =
  30. 30.132 + 57 =
  31. 31.337 + 98 =
  32. 32.391 + 38 =
  33. 33.253 + 97 =
  34. 34.430 + 58 =
  35. 35.268 + 97 =
  36. 36.350 + 97 =
  37. 37.132 + 17 =
  38. 38.134 + 27 =
  39. 39.35 + 58 =
  40. 40.135 + 67 =

Answer key

  1. 488
  2. 376
  3. 405
  4. 542
  5. 509
  6. 160
  7. 140
  8. 519
  9. 225
  10. 380
  11. 219
  12. 321
  13. 489
  14. 369
  15. 332
  16. 421
  17. 329
  18. 522
  19. 124
  20. 369
  21. 215
  22. 83
  23. 206
  24. 212
  25. 282
  26. 81
  27. 369
  28. 196
  29. 167
  30. 189
  31. 435
  32. 429
  33. 350
  34. 488
  35. 365
  36. 447
  37. 149
  38. 161
  39. 93
  40. 202

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