# Pre-Algebra: Least Common Multiple Help

This page is for pre-algebra students who need help, and for teachers and tutors who are looking for resources on least common multiple.

# Pre-Algebra: Least Common Multiple

The least common multiple of a given set of whole numbers is the smallest whole number that is divisible by each number in the set.

In arithmetic and number theory, the least common multiple or lowest common multiple (lcm) or smallest common multiple of two integers a and b is the smallest positive integer that is a multiple of both a and b. Since it is a multiple, it can be divided by a and b without a remainder. If there is no such positive integer, e.g., if a = 0 or b = 0, then lcm(a, b) is defined to be zero.

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# Pre-Algebra: Least Common Multiple Videos

Solving Equations With Fractions With Unlike Denominators 2
Video Clip Length: 2 minutes 5 seconds
Video Clip Views: 33679

denominator, equations, fractions, lcd, lcm, least common denominator, least common multiple, like denominators, number sense, numbers, solving equations, unlike denominators
Addition Of Mixed Numbers With Unlike Denominators
Video Clip Length: 3 minutes 19 seconds
Video Clip Views: 17604

arithmetic operations, denominator, fractions, lcd, lcm, least common denominator, least common multiple, like denominators, mixed fractions, mixed numbers, number sense, numbers, operations, unlike denominators
Least Common Multiple
Video Clip Length: 2 minutes 36 seconds
Video Clip Views: 11400

lcd, lcm, least common denominator, least common multiple

# Pre-Algebra: Least Common Multiple Word Problems

Carl has a soccer game
Carl has a soccer game every 4th day,Matt has one every 5th ...
The greatest common factor of two numbers
The greatest common factor of two numbers is 30.  Their least common multiple is 420.  One of the numbers is 210...
Three clocks ring once at the same time
Three clocks ring once at the same time. After that, the first clock rings after every 90 minutes, the second after every 30 minutes, and third after every 60 ...

# Pre-Algebra: Least Common Multiple Practice Questions

least common multiple of 20 and 55
What is the least common multiple of 3,8...
LCM of 56 &210 =?
1/2+1/6
2,3,4
3/20 + 4 = ?