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Estimate, Bound, and Check Reasonableness
Grade Level
GRE
QR.005 Estimate, Bound, and Check Reasonableness
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A student solves 0.48x = 11.9 and reports x = 0.040. Which quick check best shows that the result is unreasonable?
A
Because 0.48 is less than 1, the quotient must be less than 11.9.
B
Because both given numbers are positive, x must be negative.
C
Since 12 × 0.5 is about 6, x should be near 6.
D
Since 12 ÷ 0.5 is about 24, x should be near 25, not 0.040.
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