Unit 2

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Surds:

You can't write root 15 exactly as a decimal. It is called a surd.

root ab = root a x root b

Rationalizing the denominator of a fraction means making the denominator a whole number. You can do it by multiplying the top and bottom numbers by the surd part.

http://youtu.be/2dmITbLzE5U (Enclavar)

http://youtu.be/-A_ARkEpBQ4 (Enclavar)

Factors and Primes:

Prime numbers are numbers which are only divisible by them self and one.

2 is the only EVEN prime number

1 IS NOT a prime number

http://youtu.be/9Bx-8aLZVbg (Enclavar)

http://youtu.be/kb0RdR-25AE (Enclavar)

http://youtu.be/WF3AobS9OTQ (Enclavar)

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