The largest two-digit even number is 98. In the decimal system, each digit can range from 0 to 9, but for a two-digit number, the first digit cannot be zero. Since we are looking for an even number, the last digit must be an even number, which leaves us with 0, 2, 4, 6, or 8. Among these options, 8 is the largest even digit, resulting in 98 as the largest two-digit even number.
There are 45 two-digit even numbers. The smallest two-digit even number is 10, and the largest is 98. The two-digit even numbers can be expressed as the sequence 10, 12, 14, ..., 98, which forms an arithmetic sequence with a common difference of 2. The count can be calculated by the formula for the number of terms in an arithmetic sequence.
679 is the product of the largest single-digit prime number and the largest two-digit prime number.
There can only be one largest two-digit prime number.
99
73 is the largest two-digit number that is prime and has prime numbers for both of its digits.
25
How about 89
The largest two-digit number that is a multiple of 9 is 90. However, since it must also be even, the largest even two-digit multiple of 9 is 72. Therefore, the largest two-digit number that meets both criteria is 72.
50 - 25 = 25
269
The largest 5-digit even number is 99998. This number is even because it ends in an 8, which is an even digit. It is also the highest possible 5-digit number, just two less than 99999, the largest 5-digit number overall.
99*99=9801