Final answer:
To convert 10 pounds to ounces, the unit you would place in the numerator of the ratio is ounces.
Step-by-step explanation:
When converting 10 pounds to ounces, you are moving from a larger unit (pounds) to a smaller unit (ounces). To convert pounds to ounces, you need to multiply by the conversion factor, which is 16. Therefore, the unit (omit the number) you would place in the numerator of the ratio is ounces.