Dopa Flash Math

Add them up before they vanish.

Every correct answer makes it faster and longer.

Pick a course

• Single digitsFive single digits to start★
• Two digitsFive two-digit numbers, and later some subtraction★★
• Three digitsSix three-digit numbers, subtraction from the start★★★

Every two clears, it gets harder — speed and length take turns

Only a wrong answer ends it. There is no clock.