This math unit I learned about factors, prime numbers, composite numbers, + and – sums and open number sentences. For extra work, I also did prime factorization and Penta Primes, a prime numbers puzzle.

I learned about prime numbers. Some prime numbers ARE 3,5 and 97. These are NOT prime numbers: 22, 40 and 14. Prime numbers have only two factors, one and itself. There are only two numbers that are not prime OR composite; one and zero. One only has one factor and zero, well, has no factors. Two is the only even prime number because it has two factors, one and two. All prime numbers are odd except 2.

I also learned about composite numbers. Composite numbers are all even except for two. Composite numbers are all even because even numbers can all be divided into more than half. Composite numbers are numbers like 10, 14 and 22. 10/5 is 2. 10/1 is 10. Composite numbers have more that two factors. The factors of 10 are 1,10,2 and 5.

We also worked on word problems. An example of one is:The man and his 23 dogs were walking along the street. Then, they met another man with 19 dogs came along. How many dogs were there now?

This is the end of my math post for today. Bye friends!