← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 854 · 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. 1.422 + 18 =
  2. 2.177 + 88 =
  3. 3.144 + 58 =
  4. 4.304 + 27 =
  5. 5.92 + 48 =
  6. 6.406 + 89 =
  7. 7.261 + 19 =
  8. 8.193 + 87 =
  9. 9.368 + 99 =
  10. 10.143 + 37 =
  11. 11.255 + 29 =
  12. 12.312 + 47 =
  13. 13.327 + 68 =
  14. 14.482 + 39 =
  15. 15.263 + 57 =
  16. 16.447 + 39 =
  17. 17.214 + 69 =
  18. 18.492 + 29 =
  19. 19.462 + 97 =
  20. 20.243 + 19 =
  21. 21.213 + 78 =
  22. 22.330 + 39 =
  23. 23.265 + 57 =
  24. 24.53 + 29 =
  25. 25.327 + 29 =
  26. 26.44 + 59 =
  27. 27.182 + 59 =
  28. 28.30 + 57 =
  29. 29.243 + 17 =
  30. 30.204 + 49 =
  31. 31.481 + 87 =
  32. 32.147 + 88 =
  33. 33.462 + 77 =
  34. 34.259 + 37 =
  35. 35.401 + 88 =
  36. 36.130 + 97 =
  37. 37.37 + 88 =
  38. 38.325 + 18 =
  39. 39.354 + 47 =
  40. 40.204 + 28 =

Answer key

  1. 440
  2. 265
  3. 202
  4. 331
  5. 140
  6. 495
  7. 280
  8. 280
  9. 467
  10. 180
  11. 284
  12. 359
  13. 395
  14. 521
  15. 320
  16. 486
  17. 283
  18. 521
  19. 559
  20. 262
  21. 291
  22. 369
  23. 322
  24. 82
  25. 356
  26. 103
  27. 241
  28. 87
  29. 260
  30. 253
  31. 568
  32. 235
  33. 539
  34. 296
  35. 489
  36. 227
  37. 125
  38. 343
  39. 401
  40. 232

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