Significant Figures Math Example 3

Solution

1. 1
   (a) $0.0046872$: significant digits are $4, 6, 8, 7, 2$. Keep first $3$: $4, 6, 8$; next digit $7 \geq 5$, round up: $0.00469$.
2. 2
   (b) $12{,}350$: significant digits $1, 2, 3, 5, 0$. Keep $1, 2, 3$; next digit $5$, round up: $12{,}400$.
3. 3
   (c) $999.6$: digits $9, 9, 9, 6$. Keep first $3$ ($9, 9, 9$); next digit $6 \geq 5$, round up: $999 + 1 = 1000$, expressed as $1.00 \times 10^3$ to show $3$ sig figs.