← Add by rounding lesson New set →

Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 572 · 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. 1.367 + 37 =
  2. 2.197 + 89 =
  3. 3.424 + 79 =
  4. 4.274 + 78 =
  5. 5.91 + 17 =
  6. 6.35 + 87 =
  7. 7.422 + 67 =
  8. 8.468 + 78 =
  9. 9.282 + 79 =
  10. 10.331 + 38 =
  11. 11.389 + 17 =
  12. 12.364 + 57 =
  13. 13.282 + 68 =
  14. 14.162 + 79 =
  15. 15.272 + 78 =
  16. 16.81 + 68 =
  17. 17.456 + 37 =
  18. 18.486 + 79 =
  19. 19.352 + 27 =
  20. 20.192 + 19 =
  21. 21.364 + 18 =
  22. 22.401 + 77 =
  23. 23.301 + 39 =
  24. 24.54 + 37 =
  25. 25.88 + 38 =
  26. 26.65 + 97 =
  27. 27.482 + 27 =
  28. 28.459 + 37 =
  29. 29.68 + 27 =
  30. 30.247 + 77 =
  31. 31.34 + 77 =
  32. 32.85 + 39 =
  33. 33.133 + 19 =
  34. 34.382 + 37 =
  35. 35.213 + 39 =
  36. 36.436 + 17 =
  37. 37.134 + 89 =
  38. 38.410 + 67 =
  39. 39.206 + 48 =
  40. 40.406 + 97 =

Answer key

  1. 404
  2. 286
  3. 503
  4. 352
  5. 108
  6. 122
  7. 489
  8. 546
  9. 361
  10. 369
  11. 406
  12. 421
  13. 350
  14. 241
  15. 350
  16. 149
  17. 493
  18. 565
  19. 379
  20. 211
  21. 382
  22. 478
  23. 340
  24. 91
  25. 126
  26. 162
  27. 509
  28. 496
  29. 95
  30. 324
  31. 111
  32. 124
  33. 152
  34. 419
  35. 252
  36. 453
  37. 223
  38. 477
  39. 254
  40. 503

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