2006-08-06 05:15:11 · 12 answers · asked by 2 2 in Science & Mathematics ➔ Mathematics
I'm rusty on math and I need to tutor a middle schooler on this concept.
2006-08-06 05:17:46 · update #1
more details, please. I need it simple, though. How do you divide a fraction by a decimal??
2006-08-06 05:24:31 · update #2
First, change either the decimal to a fraction (3/10) then take -3/4 divided by 3/10 to solve for x. Or you can change -3/4 to a decimal (-.75) then take -.75 divided by .3. Either way the solution for x will be the same.
2006-08-06 07:17:33 · answer #1 · answered by Anonymous · 4⤊ 2⤋
First convert the decimal .3 to a fraction
.3 = 3/10
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -- - - - -- -
The equation becomes
3/10x = - 3/4
10/3(3/10)x = - 3/4(10/3)
Invert 3/10 to 10/3. to both sides of the equation
x = - 3/4(10/3)
The three(3) cancell
X= - 10/4
x = - 2.5
The answer is - 2.5
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Method two using the decimal (.3) on the left side of the equation.
.3x = -3/4
.3x/.3 = - 3/4/.3
Dividing both sides by .3
x = -3/4/3/1
x = - 3/4 x 1/.3
x = - 3/1.2
Multiplying 3 x 1 = 3 and multiplying 4 x .3 = 1.2
x = - 2.5
Dividing - 3 by 1.2 equals 2.5
The answer is - 2.5
2006-08-06 12:40:48 · answer #2 · answered by SAMUEL D 7 · 0⤊ 0⤋
ok. theres two ways to solve this equation.
1. to solve it in decimal form
-3/4 is -0.75 in decimal form.
so the equation is:
.3x=-0.75
now multiply each side by 100 so that all the numbers are whole numbers:
30x=-75
now divide each side by 30:
30x/30=-75/30
x=-2.5
2. solve it using fractions
.3 is 3/10 in fraction form
so the equation is:
3/10x=-3/4
mulitply each side by 10/3, so u can get x by itself on 1 side of the equal sign:
3/10x*10/3= -3/4*10/3
x=-10/4
now reduce it:
x=-5/2
x=-2 1/2
so yeah... hope that helped ya.
2006-08-06 12:55:27 · answer #3 · answered by mmkay 2 · 0⤊ 0⤋
convert .3 to 3/10
LHS = 3x/10 = -3/4
multiply by 10/3
x = -3/4*10/3 = -30/12 = -5/2
2006-08-06 15:44:17 · answer #4 · answered by Mein Hoon Na 7 · 0⤊ 0⤋
x= -3/4 * 10/3 = -5/2 = 2.5
2006-08-06 12:22:28 · answer #5 · answered by ag_iitkgp 7 · 0⤊ 0⤋
.3x = -.3/4
Multiply both sides by 10 to remove the decimal.
3x = -30/4
Divide both sides by 3
x = -10/4
Simpliy x = -2.5
Alternate solution
Convert -3/4 to decimal
.3x = -.75
Divide both sides by .3
x = -2.5
2006-08-06 12:47:36 · answer #6 · answered by Mack Man 5 · 0⤊ 0⤋
It takes one step - multiply both sides by 10/3
x = -30/12 or -2.5
2006-08-06 12:19:37 · answer #7 · answered by jimbob 6 · 0⤊ 0⤋
If you are asking such a simple question then Either you must be just testing our knowledge (and wasting precious Internet time) or you are too small to be a member of Yahoo! Answers
2006-08-06 13:26:17 · answer #8 · answered by tuhinrao 3 · 0⤊ 0⤋
.3x = (-3/4)
(3/10)x = (-3/4)
cross multiply
-30x = 12
x = (-12/30)
x = (-2/5)
2006-08-06 12:24:06 · answer #9 · answered by Sherman81 6 · 0⤊ 0⤋
take .3 and divide by -3/4! that will give you x
2006-08-06 12:19:53 · answer #10 · answered by deal 3 · 0⤊ 0⤋