clearing fractions
DESCRIPTION
A lesson on clearing fTRANSCRIPT
Goal: To solve an equation with fractions by first clearing the fractions.
xxx 26
5
2
1
3
2
Anytime you see Fractions in the equation multiply every term of your equation by the LCD.
LCD : Least Common Denominator How do you find it? - Take all the
denominators and take the Least Common Multiple
Least Common Multiple is the number that all the numbers could be multiplied by another number to get.
I look for the largest denominator and see if it is multiple by the other denominators
If it is multiple by the rest of the denominators then I am done
If its not a multiple of the denominators then I multiply my largest denominator by 2 or 3 and keep doing the process until I find a number that is a multiple of all denominators
1) Multiply both sides to clear fractions and decimals, if necessary
2) Distribute. 3) Collect like terms on same side.4) Move variables to same side of
equation with the APE5) Move the numbers (constants) to
the other side of the equation with the APE
6) Use the MPE to solve for the variable
xxx 26
5
2
1
3
2
xxx 12534
xx 1257 x7 x7
x550 5 5x55
x 1 5 5
(2/3x) (6/1) +(1/2x) (6/1) = (5/6) (6/1) + (2x)(6)
(12x /3) + (6x /2) = (30/6) + (12x)
xx4
32
4
1
LCD = 4
Write the equivalent equation
xx 38
1
1
4 1 4 34 2
1 4 1 4
x x
1
1
- Subtract x from both sides to get the variables on the same side
- Divide by 2 to solve for x
- X=4
x +8 =3x-x -x
8= 2x
22
4=x
(1g/3) + (2/5) = (3/2) - 2g
What is the LCD?30
30 1 30 2 30 3 30 2
1 3 1 5 1 2 1 1
g g
Write the equivalent equation
gg 60451210
30 1 30 2 30 3 30 2
1 3 1 5 1 2 1 1
g g
10
1
6
1
15
1
+60 g+60 g- Add 60g to both sides to get the variables on
the same side
70 g + 12 = 45 - Subtract 12 from both sides to get the numbers on
the same side-12 -12
70 g = 33 - Divide both sides by 70 to solve for g
70 70g= 33/70
2
3
6
1
3
1p
2
36
6
1
3
16 p
912 p- 1- 1
82 p2
1
2
1
4p
Algebra Review