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JAMB 2017 · UTME (set 2) · Q21

Evaluate 0.000002310.007\dfrac{0.00000231}{0.007} and leave the answer in standard form.

Worked solution (try it first)
  1. Write both in standard form: 0.00000231=2.31×10−60.00000231 = 2.31 \times 10^{-6} and 0.007=7×10−30.007 = 7 \times 10^{-3}.
  2. Divide the numbers, 2.31÷7=0.332.31 \div 7 = 0.33, and subtract the powers, 10−6−(−3)=10−310^{-6 - (-3)} = 10^{-3}.
  3. 0.33×10−3=3.3×10−40.33 \times 10^{-3} = 3.3 \times 10^{-4}, option C.

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