This is a collection of lessons created to address the 4.OA.4 common core standard for fourth grade. The lessons include:-How to identify factors.-How to identify multiples.-Divisibility rules for 2, 3, 4, 5, 6, and 9.-How to identify prime numbers.-How to identify composite numbers.-Problem solving (word problems) using factors, multiples, prime numbers, and composite numbers.There are 67 slides in this file, which should last you approximately one week. The practice problems at the end of each