← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 880 · 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. 1.372 + 47 =
  2. 2.362 + 27 =
  3. 3.460 + 99 =
  4. 4.34 + 69 =
  5. 5.162 + 17 =
  6. 6.145 + 57 =
  7. 7.147 + 28 =
  8. 8.27 + 57 =
  9. 9.186 + 97 =
  10. 10.321 + 79 =
  11. 11.66 + 47 =
  12. 12.76 + 98 =
  13. 13.489 + 88 =
  14. 14.343 + 18 =
  15. 15.34 + 87 =
  16. 16.429 + 18 =
  17. 17.118 + 99 =
  18. 18.473 + 49 =
  19. 19.347 + 87 =
  20. 20.464 + 29 =
  21. 21.468 + 57 =
  22. 22.292 + 99 =
  23. 23.292 + 87 =
  24. 24.209 + 57 =
  25. 25.363 + 78 =
  26. 26.236 + 17 =
  27. 27.107 + 37 =
  28. 28.69 + 19 =
  29. 29.213 + 28 =
  30. 30.172 + 47 =
  31. 31.76 + 99 =
  32. 32.91 + 59 =
  33. 33.133 + 29 =
  34. 34.166 + 27 =
  35. 35.113 + 68 =
  36. 36.66 + 37 =
  37. 37.37 + 27 =
  38. 38.150 + 27 =
  39. 39.131 + 88 =
  40. 40.483 + 78 =

Answer key

  1. 419
  2. 389
  3. 559
  4. 103
  5. 179
  6. 202
  7. 175
  8. 84
  9. 283
  10. 400
  11. 113
  12. 174
  13. 577
  14. 361
  15. 121
  16. 447
  17. 217
  18. 522
  19. 434
  20. 493
  21. 525
  22. 391
  23. 379
  24. 266
  25. 441
  26. 253
  27. 144
  28. 88
  29. 241
  30. 219
  31. 175
  32. 150
  33. 162
  34. 193
  35. 181
  36. 103
  37. 64
  38. 177
  39. 219
  40. 561

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