Saturday, January 21, 2012

Charry's Estimating Square Root Scribe Post

What is square root?
-Square root is the inverse of squaring.
-It is a number multiplied by itself.

A Square Root van be thought of as aside in a square.

You can find the approximate of a number using perfect square. the whole number is the same as the smaller perfect square for all in between.

To estimate a fractional √ we can find find the whole number.
-To find the denominator of the fraction we subtract the perfect squares.
(25-16=9)

-To find the numerator we count the

positions between a

perfect squares.

Textbook Questions
5, 12,and 15

5) estimate each value, to one decimal place. Check your answer with calculator.

12) While shopping online, Ji Hun finds a square rug with an area of 11

m² . He needs to know if it will fit in his 4mx5m bedroom.

a)Estimate the side length of the rug, to one decimal place.

b)Check your estimate with a calculator.

3.316

c)Will the rug fit? Explain.

Yes, because the area of the bedroom is 20m² . The square root of the area which is 20 is 4.472 and the square root of the rug (11) is 3.316 .

15) Order the following numbers from least to greatest 7, √46, 5.8,√27,6.3

7x7=49

√46

6.3x6.3= 39.6

5.8x5.8= 33.8

√27