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WAEC 2025 · Paper 1 · Q4✱✱

Simplify 0.027−130.027^{-\frac13}.

Worked solution (try it first)
  1. 0.027=2710000.027 = \frac{27}{1000}, and its cube root is 310=0.3\frac{3}{10} = 0.3.
  2. The negative index means the reciprocal: 10.3=103\frac{1}{0.3} = \frac{10}{3}.
  3. As a mixed number, 103=313\frac{10}{3} = 3\frac13, option B.

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