a box has a length of 2 1/2 feet, width 3 1/3 feet and height of 4 1/4?

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V = 5/2 x 10/3 x 17/4 ft ³

V = 850 / 24 ft ³

V = 425 / 12 ft³

V = 35 • 4 ft²

2 1/2 × 3 1/3 × 4 1/4

= 25/3 × 17/4

= 425/12

= 35 5/12 cubic feet

When multiplying "mixed numbers" (a value has an integer value and a fraction)

A you first convert each number to an improper fraction

B then multiply

C then convert the answer to a proper fraction

Alternately: you can convert the fractions to decimals. Probably you are expected to keep the fractions as fractions, so that's what I'll do.

A

2 1/2 = 5/2

3 1/3 = 10/3

4 1/4 = 17/4

B

5/2 * 10/3 * 17/4 = 850/24

C

850/24 = 35 10/24 = 35 5/12

Units: cubic feet

you don't have a calculator? 2.5 x 3.33 x 4.25 = 35.4 ft³

Volume of box: 2 and 1/2 times 3 and 1/3 times 4 and 1/4 = 35 and 5/12 cubic feet