Today we visited SET and tried our hand at finding the six sets:
Lesson Frame:
- We will take notes about divisibility rules and prime factorization.
- I will diagram finding the prime factors of 18.
Lesson
We began our lesson by adding the divisibility rules to our math journal. I demonstrated using the divisibility rules by finding all of the factors of 12.
Next, we created a page in our journal where we could work on prime factorization. I explained that prime factorization is just finding the prime numbers that are multiplied together to make the original number. Next, I had them write down the first 6 prime numbers, which are invaluable to know:
2, 3, 5, 7, 11, 13
Then, we revisited the divisibility rules to find ALL factors of 48. We did this because I wanted to demonstrate that you can use any set of factors of a number on a factor tree and your prime factorization will always come out the same.
I had someone determine which set we would begin with. I explained that we never include the "1 x ___", because 1 is not a prime number. When we finished we had discovered that the prime factorization of 48 is 2x2x2x2x3. A second student chose another set, yet the prime factorization was still the same. Finally a third student chose a third set, again, this set had the exact same factors! Point made!
Close
To demonstrate understanding, I asked the students to diagram the prime factors of 18 using a factor tree.
Assignment
We finished our day, by completing a Fifth Grade Builder and working on Think Through Math.
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