This lesson consists of giving you the necessary "preliminaries" to do fractions. I explain what are factors, divisors, prime and composite numbers, how to do prime factorization, GCFs, LCMs, ...

The crisp new dollar bill that I have just taken from my wallet bears the serial number 24598176. It’s easy to tell that the number is exactly divisible by 2 but not by 5. Is it divisible by 3? by 4?

8 minutes ago Science Education Divisibility Rule for 5 song Divisibility tests song Divisibility tests for 5 and 10 song Divisibility Rule for 5 and 10 song Divisibility Rule for 10 song Divisibility ...