What is 9 * 9?

9 * 9 is a multiplication problem involving two 9s. The solution to this problem is 81, which means that if you multiply 9 by 9, the answer is 81. 9 is a single-digit number that is evenly divisible by three, making it a multiples of three. Additionally, 9 is the square of the number 3, meaning that 3 multiplied by itself equals 9. The multiplication table for 9 includes multiples of nine up to 9 x 10 = 90. Finally, in binary, 9 is represented as 1001.