McGraw-Hill Education GRE 2019

The process also works in reverse. If you are doing calculations with a number

that has a lot of zeros to the right or to the left of the decimal, you can use powers

of 10 as shorthand for those values:

2,400,000 = 24 × 105

0.00037 = 37 ÷ 10^5 = 37 × 10 –5

Let’s look at a GRE-style example:

(1.9)(2 × 10^6 )

190,000 =?

A 0.02

B 0.2

C 2

D 20

E 200

SOLUTION: To make the calculations easier, express the denominator as

1.9 × 105. The fraction now reads:

(1.9)(2 × 10^6 )

1.9 × 10^5

SOLUTION: Divide numerator and denominator by 1.9 to arrive at:

2 × 10^6

105 = 2^ ×^10

(^1) = 20. The correct answer is D.
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