### Instruction: A particular novel contains $40,\!000$ words. If the author completed the novel in $80$ hours, on average how many words per hour did she write?### Response: I need to find the rate of words per hour, which is the ratio of words to hours.
I can use division to find this ratio: $40,\!000 \div 80$.
I can use long division or a calculator to find the quotient.
I get $500$ as the quotient, which means the author wrote $500$ words per hour on average.