subtracting fractions?
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
302002
Basic subtraction. Ok, you are taking stuff away from what you have, so...\n\n(-3)-3 you have -3 take away three, counting down that is -6. Or you can think of it as the two -s forming a +. \n\n Ok if you have the problem...(-5)-(+3)= change the subtraction sign to + and the 3 to the oppisite in this case -3\n\nExaples\n1. (-8)-+3=   -8+-3 now it is a adding problem = -11
22859
Subract the two terms on the left giving:\n-2t < 16\n\nAdd 2t to both sides giving\n0 < 16 + 2t\n\nSubtract 16 from both sides\n\n-16 < 2t\n\nDivide both sides by 2\n\n-8 < t
615376
there are several methods,\n\nalmost all mathematical calculations like add, subtraction...... have many ways to calculate......\n\ncheck the website below to find alternate ways to calculate
519284
In order to add or subtract fractions, you must have common denominators; that is, the bottom number has to be the same. You can change the bottom number of a fraction by multiplying the entire fraction by 1. The fact that n/n=1 for all values of n except 0 makes this a lot easier. So, let's take your problems. The easiest way to get a common denominator is to multiply the first fraction by the second denominator, and the second fraction by the first denominator. (This won't be the Least Common Denominator, though. That involves factoring the numbers.)\n\n1) (4/7) + (7/p)\nSince 4/7 doesn't reduce (we can't tell 7/p), we'll want to get 7p as the common denominator. \n(4/7)(p/p) + (7/p)(7/7)\n(4p/7p) + (49/7p)\nNow that we have the same denominator, we just add the numerators. Whoops. Since we don't know what (p) is, we have to leave it as\n(49 + 4p)/7p for p != 0 . (Oh, yeah. != is one of the ways of saying "does not equal" on the computer. You might also see it as =/=, which looks more like what you would write.)\n\n2) 4/6 - 2/k. First, let's simplify 4/6 to 2/3, this will keep things easier later on. \n2/3 - 2/k. Now, a denominator we can use is 3k\n(2/3)(k/k) - (2/k)(3/3)\n2k/3k - 6/3k\n(2k-6)/3k, for k!=0\n\n3) 2=5 + 6/k. \nOK, this one solves a bit differently. We need to find a value that makes the statement true. First, let's get all the ks on one side, and everything else on the other (remember, a=b therefore b=a)\n6/k = -3\nNow, to get from here to there, we need to get the k out of the denominator. There's a property of multiplication that lets us do this, the shorthand for it is (if a=b, then ac=bc). So, we'll multiply through by k...\n6 = -3k.\nAnd now, we need to get k by itself. Normally, I'd suggest dividing by -3. But I don't particularly like division, so I'm going to tell you to multiply by the reciprocal of -3; Which is 1/(-3) or -1/3.\n6(-1/3) = (-1/3)-3k\n-2 = k
538653
Just put each number in for x and see what the answer is.  Example : -11/2 + 75 = -5.5 + 75 = $69.50 a unit.
844920
You have to isolate the "X"\n\n1. Subtract  9 from both sides\n2. Then divide both sides by 5
780468
The only thing I can come up with off the top of my head is that you can use least common factors to determine the lowest common denominator for adding/subtracting fractions.  For example, 2/15 + 5/36 ... the lowest common denominator is 3*5*3*2*2 = 180 (using the least common factors of 15 = 3*5 and 36 = 3*3*2*2).  Not terribly "real life" but a "real application" nonetheless.
607598
Fractions were always the hardest for me, and I still have to do a quick check! Rather than go through each one (add, subtract, multiply, subtract, I’ll send you a really good web site. http://www.mathleague.com/help/fractions/fractions.htm
777425
Subtract 8 from each side of the = sign and you have your answer\n\nx equals -11
1103675
1. convert both to improper fractions\n2. find the least common denominator\n3. multiply both fractions by (x/x) to make the denominator of each the LCD.\n4. subtract the numerators, put the difference over the new LCD.\n5. reduce the fraction\n6. re-convert to mixed numeral\n\n1. 61/8 - 13/3\n2. LCD is 24\n3. (61/8)*(3/3) - (13/3) *(8/8)\n    (183/14) - (104/24)\n4. (183-104)/24\n    79/24\n5. this fraction cannot be reduced\n6. 3 7/24
797941
My Dear Aunt Sally is how I learned it.\n\nMultiplication Division Addition Subtraction
832826
1/2 X + 6 = 3 + 2X\n\nSubtract 1/2 X from both sides, subtract 3 from both sides:\n\n3 = 1.5X\n\nDivide both sides by 1.5:\n\nX = 2
965696
Two add two fractions, the denominators must be equal.\n\nThe first step is to convert the addend that is a mixed number (an integer plus a proper fraction) into an improper fraction. Do this by multiplying the integer part by the denominator and then add the numerator of the fraction.\n\nExpress the result as an improper fraction (fraction with value greater than 1) whose numerator is the sum you just calculated and whose denominator is the same as the denominator of the fraction part of the mixed number.\n\nFor example: 2/3 + 4 2/5 = 2/3 + 22/5\n\nNext, find the least common denominator of these two fractions, the smallest integer that contains both denominators as factors. For the example above, this is 15. Multiple both terms by (3*5)/15, which equals 1, and therefore does not change the value of the fraction:\n\n(2/3) * (3*5)/(15) = 10/15 (the 3's "cancel out" since 3/3 = 1)\n(22/5) * (3*5)/(15) = 66/15 (the 5's "cancel out" since 5/5 = 1)\n\nNow add 10/15 + 66/15 by adding the numerators and keeping the same denominator: 76/15.\n\nFinally, express this improper fraction as a mixed number by dividing: 5 1/15
891258
Try 1 ÷ 3\n\n1/3 = 0.33333.....\n\n~ ♥ ~
903186
change the 4 to 4/1. \n\n4/1*-3/2= -12/6 and then you simplify\n\nfinal answer is -6.\n\nyes you can change -3/2 to -1.5 but you will find it easier in the long run to make the whole number (4) into a fraction. not all equations will be this simple and you won't be able to figure out what the next fraction is in your head.
4228
Multiplying fractions is the same as taking part of the number; for example, if you want half of a half, you multiply 1/2 by 1/2 to get a quarter.  Now suppose you wanted two thirds of a half.  The first thing you need to know is, what is one third of a half?  So, multiply 1/3 by 1/2 to get 1/6.  But you know you want two of those, so you multiply 1/6 by 2.  So you did:\n\n1/3 * 1/2 = 1/6\n1/6 * 2 = 2/6 (or 1/3)\n\nOr, to put it all in one step:\n2/3 * 1/2 = 2/6 (or 1/3)