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### Instructions and Help about What Form 8815 Subtract

In this lesson we're gonna focus on adding and subtracting fractions let's say if we have 3/5 plus 4/7 how can we add these two fractions well here's a simple technique first multiply five and seven this will give you a common denominator of 35 next multiply three and seven three times seven is twenty-one and also there's a plus in between multiply 5 times 4 which is 20 21 plus 20 is 41 so the answer is 41 divided by 35 let's try another example let's say if we want to subtract 7 over 8 minus 2 over 9 let's use the same technique let's multiply the two denominators 8 + 9 which is 72 and then the next one it's gonna be 7 times 9 which is 63 minus 8 times 2 which is 16 now let's subtract what is 63 minus 16 this is gonna be 47 now 47 is not divisible by 2 nor is it divisible by 3 so this is it that's the final answer so now you know how to add or subtract two fractions now what if we wanted to add or subtract let's say three fractions instead of two what should we do in this case so let's say we wish to combine 3 over 4 plus 5 over 3 minus 7 over 2 whenever you wish to add or subtract fractions the denominator has to be the same the denominator is the bottom part of the fraction and right now they're all different so how can we make them the same how can we get the commenter down there if you want to find the least common denominator Nikolas all of the multiples of 2 are 2 4 6 8 10 12 14 and so forth multiples of 3 are...