GMAT Arithmetic Explained — 1-0.000001=

1 - 0.000001 =

A. $(1.01) (0.99)$
B. $(1.11) (0.99)$
C. $(1.001) (0.999)$
D. $(1.111) (0.999)$
E. $(1.0101) (0.0909)$

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Explanation	Calculations	Help
$We first perform the subtraction by rewriting 1 with six decimal places to align the decimals$	$1.000000 - 0.000001 = 0.999999$
$We recognize that option C multiplies to this value using the difference of squares formula$	$1.001 \times 0.999 = (1 + 0.001) (1 - 0.001) = 1^{2} - (0.001)^{2} = 1 - 0.000001 = 0.999999$	Theory & Tactics Method Card EXP4-B Click to view full details

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Option C, since (1.001) (0.999) = 1 - 0.000001 = 0.999999