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Multiplying/Dividing Equations

Multiplying/Dividing Equations

Assessment

Presentation

Mathematics

7th Grade

Hard

Created by

Rebecca McDowell

Used 7+ times

FREE Resource

4 Slides • 8 Questions

1

Multiplying/Dividing Equations

Here are a few things to remember...

Slide image

2

To solve multiplication equations

  • Must do the inverse operation... which is division

  • Division property of Equality says we must divide both sides of the equation by the same number

  • ***OUR GOAL IS TO GET THE VARIABLE ON A SIDE BY ITSELF WITH A +1 AS THE COFEEICIENT***

3

Multiple Choice

 6d=246d=24  

1

 d=144d=144  

2

 d=4d=4  

3

Neither

4

Multiple Choice

 20=4y20=-4y  

1

 y=5y=5  

2

 y=5y=-5  

3

 y=80y=80  

4

 y=80y=-80  

5

none of these

5

To solve a division equation

  • You must to the inverse operation.... which is multiplication

  • Multiplication property of Equality says we must multiply both sides of the equation by the same number

  • ***OUR GOAL IS TO HAVE THE VARIABLE ON A SIDE BY ITSELF WITH A COEFFICIENT OF +1***

6

Multiple Choice

 x3=6\frac{x}{3}=-6  

1

 x=2x=-2  

2

 x=2x=2  

3

 x=18x=-18  

4

 x=18x=18  

5

none of these

7

Multiple Choice

 c8=7\frac{c}{8}=-7  

1

 c=56c=56  

2

 c=56c=-56  

3

 c=78c=-\frac{7}{8}  

4

 c=78c=\frac{7}{8}  

5

none of these

8

When you have a fraction as a coefficient... how do you "undo" multiplying by a fraction?

 25p=6\frac{2}{5}p=6  

  • You need to use the multiplicative inverse which will give you a 1 as the coefficient

  •  5225=1010=1\frac{5}{2}\cdot\frac{2}{5}=\frac{10}{10}=1  

  • Multiply both sides by  52\frac{5}{2}  

  •  5225p=652\frac{5}{2}\cdot\frac{2}{5}p=6\cdot\frac{5}{2}  

  •  p=302=15p=\frac{30}{2}=15  

9

Multiple Choice

What is the multiplicative inverse of

 85-\frac{8}{5}  

1

 85\frac{8}{5}  

2

 58\frac{5}{8}  

3

 58-\frac{5}{8}  

10

Multiple Choice

 85b=8-\frac{8}{5}b=8  

1

 b=1b=1  

2

 b=1b=-1  

3

 b=5b=5  

4

 b=5b=-5  

5

none of these

11

Multiple Choice

 38h=9\frac{3}{8}h=-9  

1

 h=24h=-24  

2

 h=24h=24  

3

 h=27h=27  

4

 h=27h=-27  

5

none of these

12

Multiple Choice

 14=23x-14=\frac{2}{3}x  

1

 x=2 13x=2\ \frac{1}{3}  

2

 x=2 13x=-2\ \frac{1}{3}  

3

 x=21x=-21  

4

 x=21x=21  

5

none of these

Multiplying/Dividing Equations

Here are a few things to remember...

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