## Thursday, October 28, 2010

### Prime Factorizaton and Square Roots

Show You Know: (page 82)

Write the prime factorization of each number. Which number is not a perfect square? Explain how you know.

prime factorization- a number written as the product of its prime factors.

45 is not a perfect square.
Textbook Questions: 1, 5, 10, 15 (pg. 85 & 86)
1.) Explain how to square the number 7.
answer: To square the number 7 you multiply 7x7=49.
5.)a.) Determine the prime factorization of 4.
b.) Is 4 a perfect square? Explain.
c.) Draw the square and label its side length.
a.) The prime factorization of 4 is 2x2=4
b.) 4 is a perfect square because its square root is a whole number with no decimals. ( 4's square root is 2)
c.)

10.) Determine the area of a square with each side length.
a.)20
b.)17
a.) area: s x s= s squared
20 x 20= s squared
20 x 20= 400 square units
b.) area: s x s= s squared
17 x 17= s squared
17 x 17= 289 square units
16.) Determine the value.
a.) square root of 9.
b.) square root of 25.
c.) square root of 1600.
a.) The square root of 9 is 3. (3x3=9)
b.) The square root of 25 is 5. (5x5=25)
c.) The square root of 1600 is 40. (40x40=1600)

Here is a video on prime factorization: