← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 430 · 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. 1.426 + 58 =
  2. 2.133 + 77 =
  3. 3.85 + 37 =
  4. 4.188 + 38 =
  5. 5.429 + 18 =
  6. 6.373 + 47 =
  7. 7.201 + 38 =
  8. 8.328 + 18 =
  9. 9.333 + 39 =
  10. 10.101 + 89 =
  11. 11.77 + 29 =
  12. 12.124 + 39 =
  13. 13.96 + 48 =
  14. 14.184 + 39 =
  15. 15.53 + 97 =
  16. 16.77 + 99 =
  17. 17.96 + 29 =
  18. 18.382 + 17 =
  19. 19.440 + 59 =
  20. 20.203 + 67 =
  21. 21.280 + 29 =
  22. 22.437 + 28 =
  23. 23.260 + 88 =
  24. 24.146 + 77 =
  25. 25.141 + 98 =
  26. 26.78 + 27 =
  27. 27.202 + 48 =
  28. 28.92 + 38 =
  29. 29.382 + 28 =
  30. 30.313 + 18 =
  31. 31.65 + 38 =
  32. 32.27 + 67 =
  33. 33.41 + 27 =
  34. 34.429 + 38 =
  35. 35.280 + 38 =
  36. 36.436 + 58 =
  37. 37.127 + 49 =
  38. 38.436 + 19 =
  39. 39.341 + 18 =
  40. 40.99 + 67 =

Answer key

  1. 484
  2. 210
  3. 122
  4. 226
  5. 447
  6. 420
  7. 239
  8. 346
  9. 372
  10. 190
  11. 106
  12. 163
  13. 144
  14. 223
  15. 150
  16. 176
  17. 125
  18. 399
  19. 499
  20. 270
  21. 309
  22. 465
  23. 348
  24. 223
  25. 239
  26. 105
  27. 250
  28. 130
  29. 410
  30. 331
  31. 103
  32. 94
  33. 68
  34. 467
  35. 318
  36. 494
  37. 176
  38. 455
  39. 359
  40. 166

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