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Mental Math and Calculation Efficiency
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GMAT
GMAT.053 Mental Math and Calculation Efficiency
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Which grouping makes 15 × 16 × 25 easiest?
A
Multiply 15 × 16 first, then multiply by 25.
B
Round 16 to 20 and adjust the product later.
C
Use 25 = 20 + 5 and distribute over both other factors.
D
Group 16 × 25 first to make 400, then compute 15 × 400 = 6,000.
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