Solve:
Solve:
To solve this problem, we will start by multiplying the whole number 7 by the fraction using the rule for multiplying a whole number by a fraction.
Calculate the product:
The fraction is an improper fraction, meaning the numerator is greater than the denominator. To convert it to a mixed number, we divide 21 by 8:
The remainder becomes the numerator of the fraction part, and the denominator remains the same as in the original fraction.
Therefore, the solution to the problem is .