Homework Help: 7th grade math help asap please

Posted by Delilah on Wednesday, October 3, 2012 at 6:39pm.

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 one-half yd long. How many pieces one and five-ninths yd long can Joy cut from the length of ribbon? (1 point)

1
2
3
4

How do you solve these problems?

7th grade math help asap please - Ms. Sue, Wednesday, October 3, 2012 at 6:53pm
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.
7th grade math help asap please - Delilah, Wednesday, October 3, 2012 at 7:27pm
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 step-by-step?
7th grade math help asap please - Ms. Sue, Wednesday, October 3, 2012 at 7:32pm
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/least-common-denominator.html
7th grade math help asap please - Delilah, Wednesday, October 3, 2012 at 7:41pm
Thanks! I still can't figure out what is the difference between a irrational number and an integer... do you know help please
7th grade math help asap please - Ms. Sue, Wednesday, October 3, 2012 at 7:52pm
Study these sites.

http://www.mathsisfun.com/definitions/irrational-number.html

http://www.mathsisfun.com/definitions/integer.html
7th grade math help asap please - Delilah, Wednesday, October 3, 2012 at 8:10pm
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
7th grade math help asap please - Ms. Sue, Wednesday, October 3, 2012 at 8:23pm
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.
7th grade math help asap please - Delilah, Wednesday, October 3, 2012 at 8:36pm
Thanks sooo much I understand it now!!!!
7th grade math help asap please - Ms. Sue, Wednesday, October 3, 2012 at 9:03pm
Yay!

And you're welcome.

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