Do Now: “Cracking the Code” (TFK 10/2014)

“…only one out of 10 schools in the U.S. offers computer-science classes.” 1.) Write this as a ratio.2.) If there are about 60 colleges in NJ, how many offer these classes using this ratio?

“…by 2020, U.S. universities will not be ale to fill a third of the country’s 1.4 million computing jobs.” 3.) Write a third as a fraction.4.) Write 1.4 million in standard form.5.) Write a multiplication problem to find how many jobs will not be filled in 2020.

1/10

6 colleges

1/3

1,400,000

1/3 (1.4)

Flashback…Find the GCF of 32 and 52.

Find the LCM of 9 and 6

4

18

Ch. 4 Fractions, Decimals, and Percents

11/10/2014 4-1 A Decimals as Fractions

• rational number- any number that can be written as a fraction

Method-

to write a decimal as a fraction or mixed number

1.) say the number properly2.) simplify by the GCF

Common decimal fraction

.1.2 ⅕.25 ¼.5 ½

.75 ¾

Write 0.4 as a fraction in simplest form.

Example 1

.4 = ⅖

Example 2Write 0.38 as a fraction in simplest form.

19

50

Example 3Write 0.264 as a fraction in simplest form.

Simplify.

33

125

Example 4The average length of a scallop shell is 2.75 inches. Express this amount as a mixed number in simplest form.

2 ¾ in.

Write each decimal as a fraction or mixed number

• Helpful hint: read the decimal properly! 5) 0.624 6) 3.42

Example 7

If one person earned 1.75% on an investment and another earned 2.15%, find the total of their earnings. Write the amount as a mixed number in simplest form.

Exit Ticket

Data taken from ONJSC at Rutgers University “Historical Monthly Station Data”

New Jersey’s levels of precipitation for the last three months are listed above (in inches). 1) Write each month as fraction or mixed

number in simplest form2) Find the difference of rainfall in August &

September. Write the amount as a mixed number in simplest form.

3) Find the total of precipitation for the last 3 months. Write the amount as a mixed number in simplest form.

August 4.4 September 2.76 October 4.13

1 16/25 in

Aug.= 4 2/5 in Sept. = 2 19/25 inOct.= 4 13/100 in

11 29/100 in

Homework

• Pg. 202 #1-34 Evens• Ch. 4 Quiz I Thursday• Wear red, white, and blue tomorrow!