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WAEC 2019 · Paper 1 · Q50

Evaluate 0.42÷2.50.5×2.05\dfrac{0.42 \div 2.5}{0.5 \times 2.05}, leaving the answer in standard form.

Worked solution (try it first)
  1. Top: 0.42÷2.5=0.1680.42 \div 2.5 = 0.168.
  2. Bottom: 0.5×2.05=1.0250.5 \times 2.05 = 1.025.
  3. Divide: 0.168÷1.025=0.16390…0.168 \div 1.025 = 0.16390\ldots, which is 1.639×10−11.639 \times 10^{-1}, option C.

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