Pre-Algebra Out Loud by Mower Pat;

Author:Mower, Pat;
Language: eng
Format: epub
Publisher: Wiley
Published: 2012-07-27T16:00:00+00:00

Mini-Lesson 4.2 Greatest Common Denominator and Least Common Multiple

CCSS Standard 6.NS: Number System

Compute fluently with multi-digit numbers and find common factors and multiples.

The greatest common factor and the least common multiple have many applications in mathematics. First, we discuss the greatest common divisor (or factor).

A common factor is a multiplier or divisor shared by two or more numbers. The greatest common factor (often called the greatest common divisor, GCD) is the largest factor that two or more numbers or terms have in common. The GCD is used to simplify fractions. Example: .

There are two methods for finding the GCD of two or more numbers: the all-factors method and the prime factorization method.

All-Factors Method for Finding the GCD 1. Write out (or list) all the whole number factors for each of the numbers.

2. Circle or underline all common factors.

3. Select the greatest of the common factors.

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