← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 7 · 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. 1.66 + 27 =
  2. 2.44 + 77 =
  3. 3.217 + 69 =
  4. 4.80 + 39 =
  5. 5.408 + 48 =
  6. 6.389 + 57 =
  7. 7.71 + 69 =
  8. 8.263 + 89 =
  9. 9.377 + 87 =
  10. 10.97 + 97 =
  11. 11.50 + 68 =
  12. 12.465 + 89 =
  13. 13.389 + 29 =
  14. 14.446 + 99 =
  15. 15.116 + 58 =
  16. 16.90 + 88 =
  17. 17.85 + 58 =
  18. 18.379 + 19 =
  19. 19.156 + 87 =
  20. 20.349 + 89 =
  21. 21.154 + 17 =
  22. 22.283 + 69 =
  23. 23.460 + 29 =
  24. 24.265 + 88 =
  25. 25.396 + 19 =
  26. 26.482 + 38 =
  27. 27.424 + 78 =
  28. 28.368 + 19 =
  29. 29.27 + 59 =
  30. 30.378 + 77 =
  31. 31.218 + 48 =
  32. 32.183 + 29 =
  33. 33.477 + 18 =
  34. 34.310 + 49 =
  35. 35.124 + 59 =
  36. 36.45 + 37 =
  37. 37.220 + 58 =
  38. 38.468 + 27 =
  39. 39.75 + 19 =
  40. 40.392 + 57 =

Answer key

  1. 93
  2. 121
  3. 286
  4. 119
  5. 456
  6. 446
  7. 140
  8. 352
  9. 464
  10. 194
  11. 118
  12. 554
  13. 418
  14. 545
  15. 174
  16. 178
  17. 143
  18. 398
  19. 243
  20. 438
  21. 171
  22. 352
  23. 489
  24. 353
  25. 415
  26. 520
  27. 502
  28. 387
  29. 86
  30. 455
  31. 266
  32. 212
  33. 495
  34. 359
  35. 183
  36. 82
  37. 278
  38. 495
  39. 94
  40. 449

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