Here's a nice explanation of least common factor (or least common divisor) along with a few practice example exercises. Let's roll.
Greatest common factor is a free educational video by Khan Academy.It helps students in grades 6 practice the following standards 6.NS.B.4.
1. 6.NS.B.4 : Find the greatest common factor of two whole numbers less than or equal to 100 and the least common multiple of two whole numbers less than or equal to 12. Use the distributive property to express a sum of two whole numbers 1–100 with a common factor as a multiple of a sum of two whole numbers with no common factor. For example, express 36 + 8 as 4 (9 + 2)..
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