The least common multiple of 7 5 and 6 is 210. Use this link for any least common multiple up to 3 different numbers. http://www.mathsisfun.com/least-common-multiple-tool.html
The least common multipleof 7 and 9 is 63.
Use distribution to find the least or greater common factor
you use the lcm (least common multiple).
When adding or subtracting fractions with different denominators their least common multiple must be found in order to carry out the given calculations.
Use one of the usual methods to get the least common multiple. To get additional multiples, multiply this least common multiple by 0, by 1, by 2, by 3, etc.
Probably the most common use is in adding fractions with different denominators. The least common multiple of the denominators is the least common denominator. Each fraction can be converted to one with the common denominator, and then you can add the fractions by adding their numerators.
You can use any number as long as its a multiple of them and its not the least common multiple * * * * * Not quite, since it will not necessarily be the greatest such number.
To help with adding and subtracting fractions.