This powerpoint lesson teaches students to identify prime and composite numbers, determine whether a number is prime or composite, and to find the multiples of prime and composite numbers. It opens with a title page and lists the daily objectives. The lesson also states why this information is relevant (something students always tend to ask in math, 'why do I need to know this?'). Next, it discusses vocabulary "prime number" and "composite number" in great detail, along with examples. It then demonstrates prime and composite numbers using arrays. Then next slide allows students to practice with their own arrays (they can use chips at their desk as well) - if you have a Promethean Board, they can manipulate the arrays, if not, it can be done digitally and displayed for students to see. The next activity gives students a set of numbers and asks the class to identify them as prime or composite. Next, shows a neat factor tree to finding the multiples of numbers. Last is a group work activity inviting students to copy another set of numbers and make a factor tree to show its multiples, list the numbers underneath it, and conclude whether the number is prime or composite.
*if you need a formal assessment, I have a worksheet listed as "Prime/Composite Assessment" that can be used along with this powerpoint lesson