Any multiple of 98. However, "common denominators" are usually obtained for two or more numbers, not for a single number.
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multiply the denominators
You use them when there are 2 fractions with different denominators.
Every set of denominators has a common denominator, even if it's only their product.
When you're adding or subtracting fractions with different denominators, if you multiply the denominators that's your Quick Common Denominator. I'ts useful for denominators that don't have a low Least Common Factor.
By finding the lowest common multiple of the different denominators then rearranging the numerators and denominators accordingly.