4th Grade Math 5.2, Factors and Divisibility

We can tell whether one number is a factor of another number by using a "divisibility rule". A number is divisible by another number if the quotient is a counting number and there is nothing left over, there is no remainder. A factor of a number divides that number evenly, with no remainder. We can use counters or grid paper to make arrays to help us find factors. But, some numbers may be too great for us to use counters or grid paper. Division is the quickest way to find factors for greater numbers. We go over the divisibility rules for 2, 3, 4, 5, 6, and 9. We show how to use division to find if a number is divisible by another number. We make a list of all the factor pairs for 96. Divisibility and factors are related because a number is divisible by each of its factors. There is no divisibility rule for 1 because all numbers are divisible by 1. There is no divisibility rule for 0 because we can't divide by zero. If we can divide a number by 2 twice then that number is divisible by 4. We see if 2, 3, 4, 5, 6, 7, 8, or 9 are factors of 36.

4th Grade Math 5.1, Model Factors
https://youtu.be/j11iZ0Std8A

4th Grade Math Playlist (2015)
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctRibNb7V091JZfn

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.

You can practice online using the textbook's website
https://www.gomathacademy.com/

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