The image displays a problem asking to calculate the answers to several mathematical operations while keeping the results rounded to the correct number of significant figures. Let's solve each of them, applying the significant figure rules.

Given Problems:

1. $23.7 \times 3.8$
2. $45.76 \times 0.25$
3. $81.04 \times 0.010$
4. $6.47 \times 64.5$
5. $43.678 \times 64.1$
6. $\frac{1.678}{0.42}$
7. $\frac{28.367}{3.74}$
8. $\frac{4278}{1.006}$

I'll calculate these and round the results to the appropriate significant figures.