Hello!
Let's convert 3/8 to a decimal and then multiply the length of each piece of tape by how many pieces Marge used.
To convert a fraction to a decimal, simply divide its numerator by its denominator:
3 ÷ 8 = 0.375
Next, multiply this by the amount of pieces Marge cut.
0.375 × 16 = 6
Therefore, Marge used 6 inches of tape.