A third of a teaspoon, or 3/8 teaspoon, is equivalent to 0.375 teaspoons. Multiplying the fraction 1/2 by 3/4 is one way to get the solution in the fraction form of 3/8.
When multiplying two fractions, one multiplies first the numerators, or top numbers, of each fraction, and then the denominators, or bottom numbers. One must reduce the response if it cannot be expressed in the simplest terms.
Converting the fractions 1/2 and 3/4 into decimals is a second way to arrive at the solution of 0.375 teaspoons. Divide the numerator by the denominator to convert a fraction to a decimal. 1/2 equals 0.5 in decimal form, while 3/4 equals 0.75. The result is 0.375 when one multiplies 0.5 and 0.75.