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30?

3/8 + 3/5 = 15/16 ... would be the equation to this

The common denominator cannot be 30 because 16 and 8 don't multiply evenly into it.

Let's take this in chunks. Can you think of anything common that 5 and 8 can multiply into?

40 ...

yeah

i was getting 6 x5 and 8x5 backwards

Haha, no worries. Do you know how to take 3/8 and turn it into a fraction over 40?

yeah 8 goes into 40 5times so 5 times 3 =15 15/40

Exactly. Now do the same for the 3/5?

24/40

Perfect.
So now we can actually add.
15/40 + 24/40 = ?

or would it be better to make it a new question?

39/40

ok so how much more sugar does she need and how do we determine that?

subract 39/40 and 15/16

wasnt there a simple rule to figure it out? i remember me doing this in 6th grade i think.

You have to figure out if 39/40 < 15/16, and if it is, she doesn't have enough.

I'm really sorry, but I'm at school and the period is up. I have to go.

ok thanks

And yes, she does have enough ;)

.975 > .9375

See you later!