56 Part 1: The World of Numbers
CHECK POINT
Find the least common multiple of each pair of numbers.- 14 and 35
- 45 and 105
- 286 and 715
24. 21 and 20
25. 88 and 66
The Least You Need to Know
- A prime number has no factors other than itself and one.
- A number that is not prime is composite, except 1, which is in a category all its
own. - The prime factorization of a number writes the number as a product of primes.
- The greatest common factor of two numbers is the largest number that is a factor
of both. - The least common multiple of two numbers is the smallest number that is a
multiple of both.