We can use the volume formula for a cube/rectangular prism to solve.
V = w * h * l
Turn all the fractions into improper fractions and find common denominators.
4 1/2 = 9/2
2 1/2 = 5/2
6 = 12/2
Multiply.
9/2 * 5/2 * 12/2
45/4 * 12/2
540/8
67 1/2
We can write the answer in 3 ways if necessary.
67 1/2, 135/2, or 67.5
Best of Luck!