7th grade math help asap please
posted by Delilah on .
1.
1/9 + (5/7) = ?
2.
11/12 + (2/3) = ?
3.
What is the difference between an irrational number and an integer?
21.
A length of ribbon is three and onehalf yd long. How many pieces one and fiveninths yd long can Joy cut from the length of ribbon? (1 point)
1
2
3
4
How do you solve these problems?

I'll do the first one.
1/9 + (5/7) =
First, find the common denominator.
1/9 = 7/63
5/7 = 45/63
7/63 + (45/63) = 52/63
I'll be glad to check your answers for the other problems. 
Thanks! but i still don't understand how you got 7/63 in the first step. So is there any way you could show me how to do the second one stepbystep?

1/9 = 7/63
I multiplied both the numerator and denominator by 7.
Study this site for how to find the least common denominator.
http://www.mathsisfun.com/leastcommondenominator.html 
Thanks! I still can't figure out what is the difference between a irrational number and an integer... do you know help please

Study these sites.
http://www.mathsisfun.com/definitions/irrationalnumber.html
http://www.mathsisfun.com/definitions/integer.html 
thanks so much! Those sites really helped! Can you help me solve this problem:
A length of ribbon is 3 1/2 yd long. How many pieces 1 5/9 yd long can Joy cut from the length of ribbon? (1 point)
1
2
3
4 
The easiest way is to change these to improper fractions.
3 1/2 = 7/2
1 5/9 = 14/9
(7/2) / (14/9) =
(7/2) * (9/14) = 63/28 = 2.25
She can cut two pieces of ribbon from this length. 
Thanks sooo much I understand it now!!!!

Yay!
And you're welcome. 
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