Q&A #6440

Teachers' Lounge Discussion: Textbook for Consumer Math

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From: Loyd

To: Teacher2Teacher Public Discussion
Date: 2009012921:22:45
Subject: Re: Calculating Unit Price; correct last post

Nowadays, you often hear "Miles a gallon." Of course, it is "Miles per Gallon." This statement means divide miles by gallons. Per means to divide. The symbol for percent is % which is means divide by 100. So, if you have 75 percent, you divide by 100 and get the decimal, .75. This little bit of knowledge helps to find unit cost when shopping in the grocery store. The percent sign is a slash which separates two zeros as follows: 0/0. This symbol just means divide by 100. So, if you want cost per ounce and if you understand that per means divide then you just put the number of ounces over the price and the result is the unit cost. For example: Suppose spaghetti costs 96 cents for 16 ounces. Find cost per ounce. Just divide cost by price and you get the unit price. 96 cents/16 ounces = 6 cents per ounce. Try to avoid saying such things as Miles a gallon or cost an ounce. Instead, substitute “per” for “a” and “an.”

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