Question

OK need more help What is 3/8 +5/7? is it 8/15.

Answer 1

Ty M

Answer 2

That is not correct.

Answer 3

both denominators must be the same.

Answer 4

when we add and subtract they must be the same, multiplying you do not.

Answer 5

you must find the lowest common multiple ( LCM of 8 and 7

Answer 6

so would it be 1/7?

Answer 7

you can only add the top numbers when the denominator is the same

Answer 8

nope that isn't correct.

Answer 9

LCM = 7*8 = 56

Answer 10

Lets find the LCD(Least Common Denominator) HINT: If we cannot find a number lower, we usually multiply the bottom numbers, so in this case 7*8 =?

Answer 11

cwrw trying to steal my Q!

Answer 12

now you need to convert 3/8 to something over 56

Answer 13

so 61/56 ? Im lost

Answer 14

correct.

Answer 15

ok - sorry - you carry on

Answer 16

:p

Answer 17

ty all

Answer 18

Do you undertstand how you got that answer though?

Answer 19

Yes and no?
56yes but no to sure on the 61

Answer 20

So if you divide 25/6 by 5 is it 5/6?

Answer 21

ty

Answer 22

well actually I wouldn't say that.

Answer 23

normally the trick when you have multiple denoms you do this.

A/B/C = A *C/B

Answer 24

Sorry I said yes, when I was checking my answer it seemed to give me that, and the other one I thought.

Answer 25

So 25 / 6 / 5 would be 25 * 5/6

Answer 26

so would it be 25/30?

Answer 27

What is 25*5

Answer 28

125

Answer 29

/6

Answer 30

so 125/6?

Answer 31

yes.

Answer 32

http://www.wolframalpha.com/input/?i=%2825%29%2F%286%2F5%29

Depending how you put it into Wolfram you could get 5/6, though I'm not 100% sure why..

Answer 33

@jim_thompson5910

Answer 34

OK ty

Answer 35

3/8 + 5/7

(7/7)*(3/8) +5/7

21/56 +5/7

21/56 + (5/7)*(8/8)

21/56 + 40/56

(21+40)/56

61/56

So 3/8 + 5/7 = 61/56

Answer 36

haha not that part :P. 25/6/5 :)