To multiply fractions, you simply multiply the numerators together and then multiply the denominators together.
So, (3/8) * (4/7) can be calculated as:
3 * 4 = 12 (numerator)
8 * 7 = 56 (denominator)
Therefore, the answer is 12/56. However, this fraction is not in its simplest form. To simplify it, you can divide both the numerator and denominator by their greatest common divisor, which is 4.
12 ÷ 4 = 3 (numerator)
56 ÷ 4 = 14 (denominator)
So, the simplified form of 3/8 * 4/7 is 3/14.