what is 1 and 1/4 * 1 * 1/4
1 + 1/4 = 5/4
So
(5/4) * (5/4) = 25/ 16 = 1 + 9/16
\(1\dfrac{1}{4}\cdot 1 \cdot \dfrac{1}{4}\\ = \dfrac{5}{4}\cdot \dfrac{1}{4}\\ = \dfrac{5}{16}\)
