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So in order to do this problem you will need to make the denominators like terms because this is an addition problem.
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?
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?
Perfect. So now we can actually add. 15/40 + 24/40 = ?
actually while we are at it ... how do you figure out the smallest common denominator? i always had a hard time with that. wasnt it something about prime numbers?
or would it be better to make it a new question?
Oh no, I can answer it. If it takes you a while to figure it out, it's more than likely the lowest common denominator is some random number we don't know off the tops of our heads. I wouldn't bother with it in that case, just use 8*5*16 as the common denominator and then work from there.
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.
So you must compare with like denominators. Once you have a common denominator for 40 and 16, you can compare with ease.
I'm really sorry, but I'm at school and the period is up. I have to go.
And yes, she does have enough ;)
.975 > .9375
See you later!