Yesterday in class we learned about prime numbers, composite numbers and the GCF of a number. A prime number is a positive integer that is not divisible without remainder by any integer except itself and 1, for example 7 is a prime number because its only factors are 1 and itself. A composite number is a number that is a multiple of at least two numbers other than itself and 1, an example of a composite number is 20 because its factors are 4, 5, 1, 20, 2 and 10 but 7 would not be a composite number, neither would 3, 5, 13, 23 and many more. The GCF or greatest common factor of a number is the largest number that is a common divisor of a given set of numbers. An example of this that the GCF of 10 and 20 is 10 because 10 is a factor of both numbers and its the biggest factor for both numbers. Yesterday we also learned how to find the prime factorization of a number by doing the upside division rule. We also learned that you can find the GCF of 2 numbers by using a venn diagram.
by Quillen B
Subscribe to:
Post Comments (Atom)
You have good examples of the prime and the composit numbers. You also have good and detailed descriptions and examples of the GCF.
ReplyDeleteI enjoyed the detail and think you a future carrer in explaining math problems.
ReplyDeleteGreat detail and examples!
ReplyDeleteI quite enjoyed the and you are a very bright mathmetician. Nice job on the blog
ReplyDeleteVery understandable and well written. You have a wounderful future in writting paragraph reviews.
ReplyDelete-Dan D
This is a very good review of what we did in school. Yuo should very nice examples of primes and composites. I think you should be the daily scribe more often.
ReplyDeleteYou have written quite vivid notes, keep up the good work!
ReplyDelete