How do you add fractions with unlike denominators? - Answers

to add fractions the denominators must be the same. when you have unlike denominators find the LCM and rename the fractions Well first of all let's say you have one over seven and one over five ok so you multiply the denominators the bottom numbers ok so now both bottom numbers are 35 so now first let's work with 1/7 so now it's just the bottom number and now you ask yourself 7 times what equals 35 5 right so now you times five times 1 because that was your top number so now that fraction is 5/35 now let's work with the next one which is 1/5 so now u ask yourself 5 times what equals 35 7 right so you multiply 7 times 1 and get 7 so that fraction is now 7/35 so now you add 7/35 + 5/35 equals 12/35 hope that helped in order to add fractions with different denominators, you must first find a common denominator and convert both fractions to use that number as it's base. For example, 3/4 + 2/3 The common denominator is 12 because it is the lowest number that is divisible by both of them. To convert each fraction to use the common denominator (12) as its base, you multiply the numerator by the same as what you have to multiply the denominator by to get 12. In this case, for the first fraction (3/4), 4*3 = 12 so you multiply 3 (numerator) by 3 to get 9; which gives you 9/12 for the second fraction (2/3), 3*4 = 12 so you multiply 2 * 4 to get 8; which gives you 8/12 Now add the numerators while holding the denominator constant. This gives you the answer of 17/12 or 1 and 5/12