Basic number theory
Get 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.
If I show you the following list: 2, 4, 6, 8, 10,...
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 test yourself to see if you understood the lesson on this page with the quiz below.
Now dig deeper with the following number theory lessons

Feb 22, 17 01:53 PM
What is the equation of a circle? How to derive the equation of a circle?
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