Question

In each pair, tell if the fractions are equal by using cross multiplication.

a. 5⁄30 and 1⁄6
b. 4⁄12 and 21⁄60
c. 17⁄34 and 41⁄82
d. 6⁄9 and 25⁄36

Answer 1

a) yes 30/30
b) no 240/252
c) yes 1,394/1,394
d) no 216/225

Answer 2

a.
`(5)/(30) = (1)/(6)` Equal
b.
`(4)/(12) = (21)/(60)` Not equal
c.
`(17)/(34) = (41)/(82)` Equal
d.
`(6)/(9) = (25)/(36)` Not equal

To cross-multiply you must, you must multiply the numerator (x/y) of each fraction by the denominator (x/y) of the opposing fraction.