Asked by Lilly

I need help with subtracting fractions I have no idea if I'm doing it right.
Please help.

3/7-9/21

Fist you find a least common denominator, right?

So it's 21

Do you then multiply 3/7 to 3/3 so it will be 9/21

So, 9/21 - 9/21 = 1
Answered by Lilly
I mean 0
Answered by Ms. Sue
You are correct! :-)
Answered by Lilly
Yaay, thank you!
Can you check this one also!

2/3-1/16

For the LCD I got 96

So I multiplied 32/32 • 2/3 & 16/16 • 1/6
= 64/96 - 16/96
= 48/96
But I need to simplify that so
Then I divided 48/96 by 16/16
=3/6 divided by 3/3 = 1/3
Answered by Ms. Sue
To start, 48/96 = 1/2

The lowest common denominator is 48

2/3 = 32/48
1/16 = 3/48

32/48 - 3/48 = 29/48

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