lcm(a,b,c,d) = lcm(lcm(a,b,c),d) = lcm(lcm(a,b),lcm(c,d))
Two or more numbers are needed to find their lowest common denominator which is the same as their lowest common multiple.
Find the lowest common denominator by finding the lowest common multiple of the denominators
The lowest common factor of any set of integers is 1.
Find the GCF of the numerator and the denominator and divide them both by it. If the GCF is 1, the fraction is in its simplest form.
The lowest common factor of any set of positive integers is 1.
The LCD of 4/9 and 1/3 is 9. 4/9 - 3/9 = 1/9
By finding the lowest common multiple of the denominators
You can find a common denominator of any set of denominators by multiplying them together. That result will not necessarily be the lowest common denominator. Example: 1/6 and 1/9 6 x 9 = 54 and 54 is a common denominator of 6 and 9, but the LCD is 18.
To have a common denominator, you need at least two numbers to find something in common between them.
You need at least two things to find something in common between them.
Denominator
find the lowest factor that equals the numerator and denominator.