Addition
Add within 20 with four strategies — every set is generated fresh.
1 Practice set
Add within 20 with four strategies — every set is generated fresh.
Problem0
Score0
Streak0
Best streak0
Scores and streaks are kept for this session only and reset when you leave the page.
2 How it works
Rules of the set
- Every problem is generated fresh, so no two practice sets are the same.
- A correct answer on the first try earns a point and grows your streak.
- One wrong answer shows a hint. A second wrong answer shows the full worked solution.
- After the solution is shown you can still answer, but it no longer scores a point.