← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 376 · 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. 1.49 + 89 =
  2. 2.306 + 47 =
  3. 3.381 + 78 =
  4. 4.276 + 47 =
  5. 5.30 + 27 =
  6. 6.364 + 27 =
  7. 7.276 + 39 =
  8. 8.470 + 97 =
  9. 9.159 + 59 =
  10. 10.85 + 89 =
  11. 11.472 + 98 =
  12. 12.67 + 27 =
  13. 13.108 + 29 =
  14. 14.445 + 17 =
  15. 15.156 + 48 =
  16. 16.117 + 99 =
  17. 17.199 + 19 =
  18. 18.180 + 79 =
  19. 19.227 + 59 =
  20. 20.76 + 49 =
  21. 21.381 + 29 =
  22. 22.295 + 98 =
  23. 23.287 + 17 =
  24. 24.206 + 17 =
  25. 25.113 + 89 =
  26. 26.325 + 87 =
  27. 27.43 + 57 =
  28. 28.340 + 48 =
  29. 29.341 + 27 =
  30. 30.218 + 57 =
  31. 31.420 + 97 =
  32. 32.415 + 47 =
  33. 33.421 + 77 =
  34. 34.343 + 17 =
  35. 35.27 + 27 =
  36. 36.491 + 17 =
  37. 37.139 + 59 =
  38. 38.75 + 19 =
  39. 39.208 + 78 =
  40. 40.120 + 49 =

Answer key

  1. 138
  2. 353
  3. 459
  4. 323
  5. 57
  6. 391
  7. 315
  8. 567
  9. 218
  10. 174
  11. 570
  12. 94
  13. 137
  14. 462
  15. 204
  16. 216
  17. 218
  18. 259
  19. 286
  20. 125
  21. 410
  22. 393
  23. 304
  24. 223
  25. 202
  26. 412
  27. 100
  28. 388
  29. 368
  30. 275
  31. 517
  32. 462
  33. 498
  34. 360
  35. 54
  36. 508
  37. 198
  38. 94
  39. 286
  40. 169

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