JAMB 1994 · UME · Q2✱✱

Evaluate $(0.36 \times 5.4 \times 0.63) \div (4.2 \times 9.0 \times 2.4)$ , correct to 2 significant figures.

Worked solution (try it first)

Top: $0.36 \times 5.4 = 1.944$ , and $1.944 \times 0.63 = 1.22472$ .
Bottom: $4.2 \times 9.0 = 37.8$ , and $37.8 \times 2.4 = 90.72$ .
Divide: $1.22472 \div 90.72 = 0.0135$ .
The third significant figure is 5, so round up: 0.014, option B.

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