← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 550 · 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. 1.25 + 27 =
  2. 2.221 + 38 =
  3. 3.377 + 18 =
  4. 4.327 + 58 =
  5. 5.40 + 99 =
  6. 6.380 + 67 =
  7. 7.41 + 69 =
  8. 8.107 + 98 =
  9. 9.74 + 69 =
  10. 10.75 + 69 =
  11. 11.348 + 67 =
  12. 12.91 + 17 =
  13. 13.150 + 48 =
  14. 14.363 + 49 =
  15. 15.430 + 37 =
  16. 16.423 + 39 =
  17. 17.84 + 59 =
  18. 18.415 + 29 =
  19. 19.35 + 79 =
  20. 20.428 + 87 =
  21. 21.292 + 38 =
  22. 22.135 + 39 =
  23. 23.300 + 38 =
  24. 24.47 + 57 =
  25. 25.248 + 19 =
  26. 26.30 + 98 =
  27. 27.215 + 18 =
  28. 28.85 + 97 =
  29. 29.78 + 37 =
  30. 30.147 + 39 =
  31. 31.426 + 47 =
  32. 32.169 + 97 =
  33. 33.99 + 19 =
  34. 34.198 + 48 =
  35. 35.446 + 89 =
  36. 36.430 + 29 =
  37. 37.180 + 99 =
  38. 38.239 + 17 =
  39. 39.493 + 28 =
  40. 40.41 + 77 =

Answer key

  1. 52
  2. 259
  3. 395
  4. 385
  5. 139
  6. 447
  7. 110
  8. 205
  9. 143
  10. 144
  11. 415
  12. 108
  13. 198
  14. 412
  15. 467
  16. 462
  17. 143
  18. 444
  19. 114
  20. 515
  21. 330
  22. 174
  23. 338
  24. 104
  25. 267
  26. 128
  27. 233
  28. 182
  29. 115
  30. 186
  31. 473
  32. 266
  33. 118
  34. 246
  35. 535
  36. 459
  37. 279
  38. 256
  39. 521
  40. 118

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