It is 50.
25
Subtract 25 from 50.
50 - 25 = 25
10
50 - 25 = 25
The two-digit factors of 100 and 1000 are all composite.
9797 is the largest two digit prime number.
The largest single digit prime is '7' The largest two digit prime is '97'. Their product is 97 X 7 = 679.
The largest two-digit divisor of 534 is 89.
12 is the only two digit number which is a factor of 12.
98 is the largest two digit number divisible by 7.
9 and 99