← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 199 · 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. 1.122 + 48 =
  2. 2.33 + 29 =
  3. 3.214 + 27 =
  4. 4.146 + 28 =
  5. 5.384 + 89 =
  6. 6.145 + 38 =
  7. 7.105 + 87 =
  8. 8.315 + 48 =
  9. 9.106 + 99 =
  10. 10.374 + 18 =
  11. 11.244 + 68 =
  12. 12.402 + 98 =
  13. 13.421 + 88 =
  14. 14.397 + 78 =
  15. 15.328 + 87 =
  16. 16.190 + 17 =
  17. 17.244 + 67 =
  18. 18.95 + 57 =
  19. 19.141 + 79 =
  20. 20.50 + 87 =
  21. 21.208 + 87 =
  22. 22.37 + 37 =
  23. 23.211 + 97 =
  24. 24.360 + 57 =
  25. 25.110 + 79 =
  26. 26.87 + 77 =
  27. 27.346 + 27 =
  28. 28.85 + 77 =
  29. 29.260 + 19 =
  30. 30.47 + 89 =
  31. 31.269 + 58 =
  32. 32.210 + 38 =
  33. 33.359 + 39 =
  34. 34.452 + 17 =
  35. 35.81 + 97 =
  36. 36.405 + 18 =
  37. 37.340 + 19 =
  38. 38.479 + 48 =
  39. 39.432 + 48 =
  40. 40.38 + 59 =

Answer key

  1. 170
  2. 62
  3. 241
  4. 174
  5. 473
  6. 183
  7. 192
  8. 363
  9. 205
  10. 392
  11. 312
  12. 500
  13. 509
  14. 475
  15. 415
  16. 207
  17. 311
  18. 152
  19. 220
  20. 137
  21. 295
  22. 74
  23. 308
  24. 417
  25. 189
  26. 164
  27. 373
  28. 162
  29. 279
  30. 136
  31. 327
  32. 248
  33. 398
  34. 469
  35. 178
  36. 423
  37. 359
  38. 527
  39. 480
  40. 97

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