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One strategy is estimating the factors the other i don't know
There are 9 odd sums that you can get from rolling two dice.
The integers are 16 and 18.
They are 1 and 15.
The sum of two fractions will only be a whole number if the fractions have a common denominator. When the denominators are different, the sum will be a fraction with a different denominator, making it impossible to be a whole number. Thus, estimating the sum of two fractions will generally result in a fraction, not a whole number.