epdf.pub_cbest-cliffs-test-prep13a9b242c7cb4125e6cca92d00a73d5a41681

The Mathematics Section
Sometimes, however, actually working the problem can be helpful, as the next
sample demonstrates.
47. The fastest method to solve 7 ⁄48 # 6 ⁄7 is to
A. invert the second fraction and then multiply.
B. multiply each column across and then reduce to lowest terms.
C. find the common denominator and then multiply across.
D. divide 7 into the numerator and denominator, divide 6 into the
numerator and denominator, and then multiply across.
E. reduce the first fraction to lowest terms and then multiply across.
In this problem, the way to determine the fastest procedure may be to actually
work the problem as you would if you were working toward an answer. Then see
whether that procedure is listed among the choices. You should then compare it to
the other methods listed. Is one of the other correct methods faster than the one
you used? If so, select the fastest.
These types of problems are not constructed to test your knowledge of obscure
ways to solve mathematical equations. Rather, they test your knowledge of common
procedures used in standard mathematical equations. Thus, the fastest way to
solve this sample problem is to first divide 7 into the numerator and denominator:
1
7 6
48
# =
7
1
Then divide 6 into the numerator and denominator:
1 1
7 6
# =
48 7
8 1
Then multiply across:
1 1
7 6
# =
48 7 8 1
8 1
The correct answer is D.
48. Which equation can be used to find the perimeter, P, of a rectangle that has
a length of 18 feet and a width of 15 feet?
A. P= ^18h^15h
B. P= 18+
15
C. P = 2^15h^18h
D. P = ^2h15 + 18
E. P = 2^15 + 18h
The correct answer is E. The perimeter of a rectangle can be found by adding the
length to the width and doubling this sum. P = 2^15 + 18h.
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