Six cards and number systems

From one base to another, step by step

Use digits 0–9 and, above base 10, letters A–F. Non-negative integers of up to 40 digits are accepted.

Number Starting base2345678910111213141516 Target base2345678910111213141516

Convert

Guess the number with six cards

Think of an integer from 1 to 63. Look at each card and say whether it contains your number. We then add the first numbers on the selected cards.

Switch on powers of 2

Each light is worth the number above it. Switch on the lights needed to reach the target.

Target

Ten conversions to solve

Enter the number in the requested base. Questions alternate base x → 10, 10 → base y and base x → base y.

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