Can someone help me subtract factions I don't know how to borrow.

Question

12 1/3 - 7 2/5

LCD=15

So, 1/3 • 5/5 & 7/5 • 3/3
= 5/15 - 21/15

And then I have no idea what to do

Answer 1

You borrow from the whole #.

Is it like
11+1 = 1 + 5/15
Idk.

Answer 2

12 1/3 = 12 5/15 = 11 20/15
7 2/5 = 7 6/15

11 20/15 - 7 6/15 = 4 14/15

Answer 3

Oh so you just do this 1x15+5
Is it like changing a mixed fraction to an improper fraction when you are borrowing?

Answer 4

Right.

Answer 5

Thanks(: I get it now!
Can you please check my answer for this problem?
Iam 100% that it's right

6 1/12 - 5 10/24

= 6 1/2 x 2/2
= 6 2/24 - 5 10/24
= 5+1 = 5+1 2/24
1x24+2 = 26

= 5 26/24 - 5 10/24
= 16/24 divide by 4/4
= 4/6 divide by 2/2
= 2/3

Answer 6

Yay! You're right.

Answer 7

Thank you so much!(:
You've helped a lot!