Express 0.000407 in standard form.
A4.07 × 10⁻⁴CORRECT
B4.07 × 10⁻³
C40.7 × 10⁻⁵
D4.07 × 10⁴
GCEMathematicsNumber and Numeration2022
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Why the answer is A, and why the others tempt you.
To write 0.000407 in standard form, move the decimal point 4 places to the right to get 4.07, giving 4.07 × 10⁻⁴. Option B incorrectly uses an exponent of -3, while C is not in proper standard form (coefficient must be between 1 and 10), and D has a positive exponent which would make the number large.
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