Day 16: LCM & Mystery Numbers

6th Grade Math Standards: Find the greatest common factor of two whole numbers less than or equal to 100 and the least common multiple of two whole numbers less than or equal to 12. Use the distributive property to express a sum of two whole numbers 1–100 with a common factor as a multiple of a sum of two whole numbers with no common factor. For example, express 36 + 8 as 4(9 + 2). MA.4.a. Apply number theory concepts, including prime factorization and relatively prime numbers, to the solution of problems.

Objective: Find the least common multiple in a word problem context

Quote of the Day: “My mother was the greatest person in my life. She had an eighth grade education and cleaned floors at the Chicago Athletic Club for a living. Some of the greatest people in the world clean floors for a living. When you value everyone and treat everyone with respect, you may just be amazed at how they can make you better. Too often people will miss out on meaningful relationships with amazing people because they quickly pass judgment based on what that person does for a living, the clothes they wear, what kind of car they drive.” - Coach K

Question of the Day: "Is zero a prime number?" "Does zero have any factors?" "Why is it that we evolved from crawling to walking?"

Agenda:

1. Mystery Number
2. QSSQ
3. Review HW/Pepper
4. Word problem notes
5. Get to 10
6. Word problem practice with least common multiple

Assessment: Checked the homework, had students do a problem from the notes on their own, pepper to see if students were comprehending the vocabulary. Here is a look at one student's work on finding the mystery number.

Glass Half-Full: Get to 10 at the start of the second class was the best part of the lesson. Nowhere in my objective do I mention anything about numerical expressions, but it just kind of happened that students were writing and saying what a numerical expression was.

Regrets: Mystery number kind of flopped. I would have thought the three clues (multiple of five less than fifty, multiple of three and exactly eight factors) would have been a more enjoyable - at least it has been in the past.

Homework: Least common multiple word problem practice

Link of the Day: I thought that this was pretty informative as to the answer to the question about why humans walk instead of crawl. I also heard from a history teacher who happened to be in the hallway when we were discussing this that the humans would stand on their feet after they jumped out of a tree and into long grass to see if predators were present.