Adds and Subtracts

Rules

1. A 3-second countdown, then the GO signal.
2. Additions and subtractions one after another, with numbers up to 99.
3. Each sum comes with three answers and only one is right.
4. You answer with the 1, 2 and 3 keys or by clicking the answer.
5. You get 1 min from the signal.

How scoring works

Every right answer scores, more the faster you answer, and every wrong one costs you.

Levels

• Gold level2,300 points
• Silver level1,400 points
• Bronze level700 points

Levels are earned by result; medals are only for the CCI Olympics.

Tips

• Add the tens first, then the units.
• When in doubt, rule out: the last digit is often enough to tell which one it is not.

Event ranking

See the full ranking