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7th grade math help asap please

posted by 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 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 - ,

    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 - ,

    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 - ,

    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 - ,

    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 - ,

    Study these sites.

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

    http://www.mathsisfun.com/definitions/integer.html

  • 7th grade math help asap please - ,

    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 - ,

    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 - ,

    Thanks sooo much I understand it now!!!!

  • 7th grade math help asap please - ,

    Yay!

    And you're welcome.

  • 7th grade math help asap please - ,

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  • 7th grade math help asap please - ,

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  • 7th grade math help asap please - ,

    XD

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