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JAMB 2010 · UTME · Q10

Express the product of 0.21 and 0.34 in standard form.

Worked solution (try it first)
  1. Multiply without the decimal points: 21×34=71421 \times 34 = 714.
  2. There are 2+2=42 + 2 = 4 decimal places altogether, so the product is 0.0714.
  3. Move the point two places right to get 7.14, so the product is 7.14×10−27.14 \times 10^{-2}, option C.

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