Asked by lisa

find the average of

3 2/9 and 5 1/8 simplify and type a mixed number
Answered by Ms. Sue
Add the two together and divide by 2.

Answered by lisa
Do I have to find the lcd first
Answered by helper
Yes, always. All fractions have to have the same denominator to add.
Answered by lisa
8 25/72
Answered by helper
Not correct.

Post your work so I can see what you are doing wrong, because you are not even close. :)
Answered by lisa
3 16/72+5 9/72= 8/25/72
Answered by helper
What grade are you in?

Unless there is a new way taught for adding fractions, you can't do it like that.

You have to convert each mixed number to a fraction

3 2/9 = 29/9
5 1/8 = 41/8

Then you add
29/9 + 41/8
Find the LCD
232/72 + 369/72 = 601/72

601/72 divided by 2, multiply by 1/2
601/72 * 1/2 = 601/144 = 4 25/144
Answered by helper
Ok, sorry, your answer 8 25/72,
was the SUM, not the final answer, which is the average.

8 25/72 is correct for the sum.

You have to divide the sum by 2, for the average.

So however you were adding is correct.

Answered by helper
And, ignore how I said that I do it. Do it your way, however you were taught. Your way IS correct.

I just prefer to do it the way I was taught. I don't want to confuse you. :)

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