← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 795 · 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. 1.143 + 29 =
  2. 2.158 + 77 =
  3. 3.269 + 57 =
  4. 4.128 + 18 =
  5. 5.117 + 99 =
  6. 6.84 + 19 =
  7. 7.300 + 29 =
  8. 8.452 + 17 =
  9. 9.302 + 28 =
  10. 10.325 + 38 =
  11. 11.307 + 18 =
  12. 12.303 + 67 =
  13. 13.389 + 78 =
  14. 14.107 + 47 =
  15. 15.464 + 99 =
  16. 16.248 + 27 =
  17. 17.212 + 99 =
  18. 18.150 + 89 =
  19. 19.133 + 99 =
  20. 20.244 + 68 =
  21. 21.340 + 38 =
  22. 22.134 + 38 =
  23. 23.136 + 17 =
  24. 24.459 + 17 =
  25. 25.102 + 48 =
  26. 26.470 + 99 =
  27. 27.218 + 49 =
  28. 28.125 + 37 =
  29. 29.180 + 29 =
  30. 30.275 + 99 =
  31. 31.419 + 87 =
  32. 32.143 + 47 =
  33. 33.338 + 38 =
  34. 34.458 + 67 =
  35. 35.93 + 78 =
  36. 36.121 + 19 =
  37. 37.292 + 19 =
  38. 38.119 + 68 =
  39. 39.115 + 39 =
  40. 40.222 + 58 =

Answer key

  1. 172
  2. 235
  3. 326
  4. 146
  5. 216
  6. 103
  7. 329
  8. 469
  9. 330
  10. 363
  11. 325
  12. 370
  13. 467
  14. 154
  15. 563
  16. 275
  17. 311
  18. 239
  19. 232
  20. 312
  21. 378
  22. 172
  23. 153
  24. 476
  25. 150
  26. 569
  27. 267
  28. 162
  29. 209
  30. 374
  31. 506
  32. 190
  33. 376
  34. 525
  35. 171
  36. 140
  37. 311
  38. 187
  39. 154
  40. 280

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