Basic number theoryGet a strong understanding of the very basic of number theory. Life is full of patterns, but often times, we do not realize as much as we should that mathematics too is full of patterns You may immediately conclude that the next number after 10 is 12. If I show you also the following list: 2 × 1, 2 × 2, 2 × 3, 2 × 4,... What comes next? Of course it is 2 × 5 Exploring number patterns can really help you develop a strong understanding of mathematics concepts. It is my desire that you develop a love for this topic and others to come. In this unit, you will explore some other interesting patterns while I teach the following topics: Identify prime and composite numbers. Find least common multiple find greatest common factor. Find multiples for a given number Divisibility tests To use sets of numbers to find and describe number patterns Problems that can be solved with number theory: Example #1: What is the least number of marbles that can satisfy the following situation: Put the marbles in 2 piles with no leftovers Put the marbles in 5 piles with no leftovers Put the marbles in 7 piles with no leftovers To solve this problem, you can play around with the marbles until you find the correct combination
However, you could get the least common multiple of 2, 5, and 7. LCM (2,5,7) = 70 You need 70 marbles Example #2: Your father wants to give you some money if the following condition is met You can share the money with either 2, 3, or 6 people The money is less than 100 dollars You need divisibility rules to solve this problem. There may be more than one solution All you have to do is to make sure that the number is divisible by 2, 3, and 6 at the same time Possible solutions: 42, 12, and 84 Example #3: A clown waves at people every 3 minutes A second clown waves every 4 minutes A third clown waves every 5 minutes When will all 3 clowns wave at the same time? Just get the least common multiple of 3, 4, and 5 LCM(3,4,5) = 60 All clowns will wave at the same time in 60 minutes Now dig deeper with the following number theory lessons Greatest common factor Learn to get the greatest common factor of two numbers Counting factors How many factors can a number have? Least common multiple Learn how we found the least common multiple for example #3 Prime number What is a prime number? Divisibility rules How to quickly tell if a number is divisible by 2, 3, 4, 5, 6, 7, 8, 9, and 10 




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