



 
Hi Jessica, I also am not sure what is expected here. What I do see is that 478 is just a bit smaller than 4800 and 12 divides 48 so my estimate would be \[\frac{12}{478} \mbox{ is approximately } \frac{12}{4800} = \frac{1}{40}.\] Here 12 and 4800 are compatible numbers since the division is easily done mentally. I don't know what other pair of compatible numbers is expected. $\large \frac{1}{40}$ is very close to the exact answer. Penny  


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