Number Play: Logic & Cryptarithms
Unlock letter-arithmetic cryptarithms, test divisibility shortcuts & digital roots, and master the traditional Navakankari strategy board!
In cryptarithms, distinct letters represent distinct digits (0 to 9) and the first digit is never 0! Use parity, units digit patterns, and place value expansion to deduce each digit.
Warmup: Divisibility Detective
A number is divisible by 9 if and only if the sum of its digits is divisible by 9. Find the missing digit!
Each letter stands for a unique single digit (0-9). The leading digit is not 0.
"When grouped in 3's, remainder is 1. Grouped in 5's, remainder is 1. When grouped in 7's, remainder is 0. Total pebbles are less than 100. How many pebbles are there?"
Traditional Indian Strategy Game: Click empty intersections to place Red (Player 1) and Yellow (Player 2) pawns. Form 3 in a row!
Enter any integer up to 10 digits to see its digital root breakdown (Mahāsiddhānta method), parity, and divisor properties!