Number Theory
- Factor
- to factor means to write as a product
- Factor 6
- $ 6 = 2 \cdot 3 $
When factoring, it is often useful to list only the prime factors. Usually, we do not list 1 as a factor.
- Prime
- A prime number is a natural number (positive, whole) only divisible by 1 and itself. A prime number must also be greater than 1. 2 is the first prime number. 2 is the only even prime number.
- Composite
- A composite number is a natural number greater than 1 that is not prime.
- Factor 26
- $ 2 \cdot 13 $
- Factor 125
- $ 5 \cdot 5 \cdot 5 $
- Least common multiple (lcm)
- The least common multiple of two numbers is the smallest number evenly divisible by both numbers (no remainder).
The least common multiple of 3 and 6 is 6.
What is the least common multiple of 3 and 4? Write out several multiples until a number matches both.
