A Multiplication Based Logic Puzzle

109 and Level 2

109 is a prime number. 109 = 1 x 109. Its only factors are 1 and 109. Prime factorization: none.

How do we know that 109 is a prime number? The square root of 109 is an irrational number approximately equal to 10.44. If 109 were not a prime number, then it would be divisible by at least one prime number less than or equal to 10.44. Since 109 cannot be divided evenly by 2, 3, 5, or 7, we know that 109 is a prime number.

109 is never a clue in the FIND THE FACTORS puzzles.

2014-18 Level 2

This week’s puzzles and last weeks solutions: 12 Factors 2014-05-05

2014-18 Level 2 Factors

Advertisements

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

Tag Cloud