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Estimation and Answer-Choice Elimination
Grade Level
ACT Prep
ACTM.003 Estimation and Answer-Choice Elimination
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A scientific-notation item asks for (6.1 x 10
5
)(3.2 x 10^-2). Possible values include 1.95 x 10^-4, 19.5, 1.95 x 10
4
, and 1.95 x 10
7
. Which magnitude check is best?
A
Multiply coefficients to get about 20 and powers to get 10
3
, so the value is about 2 x 10
4
.
B
Add the exponents and keep the coefficient 6.1 unchanged.
C
Subtract 5 and -2 because one exponent is negative.
D
Multiply 10
5
and 10^-2 to get 10^-10.
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