how do you add or subtract fractions with different denominators?
435646
You must first find the lowest common denominator, then then multiply each top by the same  and then add. Example\n3/5 + 1/2 = 6/10 + 5/10 = 11/10 or 1 1/10
288259
Fractions must have a common denominator for you to subtract them.\n\n5/8  -   3/8   =    2/8\n\nTo find the simplest form, find a number that is common to the numerator and the denominator, then divide both by that number.  As long as you can find a number common to both the numerator and the denominator you are not at the lowest or simplest form!\n\n4/20= dividing the numerator and the denominator by 2, 2/10 ooops not done yet,\n2/10 dividing by 2 =  1/5\n\nNow we are done! \n\nHave Fun,  Good Luck
106265
the answer is 4/9\n\nThink about the quesiton this way:  Whenever you are adding or subtracting fractions they need the same common denominator (bottom number).  You can multply any bottom number as long as you do the same to the top as well.  if you change 1/3 to 3/9 then you multplyed the top and bottom by 3.  so now you can easily see that you need to cut 4/9 to end up with 3/9 which is the same as 1/3!
883625
You can find the answer by turning the fraction into a decimal. Divide the denominator into the numerator. \n\nSo, for example, divide 3 into 1. This will give you the fraction expressed as a decimal. Then compare it to .35.\n\nDo the same thing with the second one.
289395
Find the commone denominator, and then convert both fractions into their equivalents using that denominator.  For example, 1/2 can also be written as 2/4, 3/6, 4/8, etc.  Once both fractions have the same denominator, just add the numerators and reduce.\n\nTo add 1/3 + 4/9, the common denominator is 9.  4/9 is already done, so you would just need to change 1/3.  3 goes into 9 3 times, so multiply the top and bottom by 3 (or multiply by 3/3, which is the same as multiplying by 1 - perfectly legal in math :) 1/3 * 3/3 = 3/9\n\nNow you have 3/9 + 4/9 = 7/9 --- this cannot be reduced any further.
843077
Who sez?  You need a common denominator to ADD two fractions.  To multiply, just do separate operations on the numerator and denominator.
297932
Add 3/8 to each side to get A by itself:\n\nA = 3/8 - 7/12\n\nThen you need a common denominator to add the two fractions together.  The common denominator is 24, to get that multiply 7/12 by 2/2 (which is one) to get 14/24.  7/12 = 14/24.\n\nDo the same for 3/8 multiply it by 3/3 (which is one) to get 9/24.  3/8 = 9/24\n\nSo 9/24 - 14/24 = -5/24\n\nA= -5/24
820171
First change them to improper fractions to do this multiply the whole number by the denominator so in 3 and 7/8 you would take 3 times 8, once you got that you would add it to the numerator so\n\n3x8=24\n7+24=31\n\nso you have 31/8 for the first fraction\n\nrepeat this step for the second\n2x10=20\n20+9=29\n\nthe second is 29/10\n\nNow you must fine the lowest common denominator for both fractions, which means find a number both 8 and 10 divide into evenly. Both go into 40 evenly, so you want the denominator to be 40 on both fractions, to do this multiply the top and bottom of each so that the denominator is 40 so for the first fraction, 31/8 you would multiply both the top and bottom by 5.\n\n(31/8)x5=155/40\nand the second fraction\n(29/10)x4=116/40\n\nnow you can subtract them\n\n(155/40)-(116/40)=39/40
1147365
Find a common denominator and add all of the fractions together.  The common denominator of 4, 6, and 3 is 12.  1/4 becomes 3/12, 1/6 becomes 2/12, and 1/3 becomes 4/12.  Now add them all together to get 9/12.  Since 12/12 would be her whole income, the stuff that is left is 12/12 - 9/12, which is 3/12, or 1/4.
677314
To do this, you do (2/3) / (1/5). You must flip the denomiator fraction over and change the operation to multiplication. So... that would be (2/3) * (5/1) which would be 10/3.
1094865
You need to get a common denominator.  Let's choose 3d.  To make the first fraction have that denominator, multiply by 3/3 to get 21/3d.  To make the second fraction have it, multiply by d/d to get 2(d^2)/3d.  Now you can add the numerators and get \n(21+2d^2)/3d.  \n\nYou cannot reduce any farther because 21 and 2dsquared share no common terms. (21 = 3*7 and 2d^2= 2*d*d).
407989
Just cross of like terms in the numerator and the denominator and see what is left.  like in the first problem the numerator and the denominator share two two's and a 3, so by crossing them off you are left with 4/7.  You can do that since 2/2 is one, and likewise with other similar fractions, and when you multiply by one you always get the same fraction.
890923
To find the common denominator between fractions simply multiply the denominators and this is the common denominator.\n\nHowever this number may be large so try and find a number that all denominators will divide into evenly.\n\nHope this helps.
215144
Multiply the numerators together.  Then multiply the denominators together.  Just go straight across.  If you want, you can simplify the fractions in the beginning so that it's a bit easier.  Then if your answer isn't in lowest terms, I'd simplify that too.  Hope I helped!
327077
generally, you combine like terms and then subtract the same thing from both sides and/or divide both sides by the same thing.  but that may b 2 vague to help much.  i need a specific question.
831251
This problem is kind of neat. We have two fractions in a compound fraction - one in the numerator and one in the denominator. Since both fractions have the same denominator:\n\n(x + 4y)/y and (x + y)/y\n\nWe can eliminate the y's and form a fraction out of the numerators. Note that we can only do this because the denominators are the same.\n\nSo the original expression equals:\n\n(x + 4y)/(x + y)\n\nAnother way to do this is to multiply the fraction in the numerator by the reciprocal of the fraction in the denominator.\n\n(x + 4y)/y * y/(x + y) =  y(x + 4y) / y(x + y) = (x + 4y) / (x + y)
384333
Take the decimal number and multiply it by a number.  Then take the sum and divide it by the multiplier.\n\nI'm supposing you know the decimal number you want to express in a fraction.