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Mathematics
OpenStudy (anonymous):

adding and subracting unlike denominators..

OpenStudy (hoblos):

find a common denominator

OpenStudy (anonymous):

thanks for your reply...its for my son he is in the 6th grade. is there an easier way to find it?

OpenStudy (hoblos):

no it is the easiest

OpenStudy (anonymous):

ok...so it says to write answer in the simpliest form for 1/2 + 2/3 is the common deno. 6?

OpenStudy (hoblos):

yes so 1/2=3/6 & 2/3=4/6 =>1/2 + 2/3 = 3/6 + 4/6 = 7/6

OpenStudy (anonymous):

you are awesome!!!!! now dose the same formula apply to the fraction when you subtract?

OpenStudy (hoblos):

yes you use the same formula

OpenStudy (anonymous):

great!!!! ok i would love for my son to see this will you b on here after four pm central standard time?

OpenStudy (anonymous):

it is easy when you have denominators like 3 and 2, 6 and 8, but gets somewhat more complicated when you have denominators like 98 and 84

OpenStudy (anonymous):

there is in fact a "method" for finding the least common multiple of two numbers

OpenStudy (anonymous):

oh boy!!! we are going to need all the help we can get. please share the method with me?

OpenStudy (anonymous):

if you have numbers with no common factors like 2 and 3 you multiply them together. so lcm (2,3) is 6 and lcm(4,7) is 28 but if they have common factors like 8 and 12 you can write \[8=2^3,12=2^2\times 3\] and so \[lcm (8,12)=2^3\times 3=24\]

OpenStudy (anonymous):

usually an elementary school class will not have large denominators, and often (unfortunately) the teacher will simply put the numbers on the board and wait for someone to come up with the lcm it is relatively easy to see for small numbers like 8 and 12, or 6 and 9 (it would be 18) but there is the method of factoring and then taking each prime factor you see to the highest power you see in any one number.

OpenStudy (anonymous):

hi my name is gj just got home from school can some one help me with fractions?

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