JAMB 2014 · UTME · Q4

Indices & standard form

Express the product of 0.00043 and 2000 in standard form.

Worked solution (try it first)

$2000 = 2 \times 1000$ , so first double: $0.00043 \times 2 = 0.00086$ .
Multiplying by 1000 moves the point three places right: $0.86$ .
0.86 is $8.6 \times 10^{-1}$ , option D.

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