Chapter 1...easy????

Definition of the terms...

• Fractions

A number that can be written as a quotient of two quantities is called a fraction.

E.g,. 1/2 and 3/4

The number that above the line in a fraction is called the numerator and it tells how many parts are being talked about or considered. The number below the line in a fraction is called the denominator and it indicates the numer o parts in the whole. It tells what kind or size of parts the numerator counts.

• Decimals

Decimals are another way to express fractions. Decimals are based on a base-ten place-value system in which tenth an multiples of tenths are used to represent a number.

E.g., 1/2 = 0.5 and 3/4 = 0.75

• Percents

Percents are simply another way of representing fractions and decimals that are based on hundreths. For example, 12/100 or 0.12 can be thougt of as 12%. "Percent" means "per hundred" or "for every 100". So, 12% is a way of representing 12 for every 100. Percents are an easy way to compare data because they have the common base of 100.

Conversion Between Fraction, Decimal and Percent...

• Converting a fraction to a percent

convert 4/5 to a percent

step 1 : devide the numerator of the fraction by the denominator... e.g,. 4/5 = 0.80

step 2 : multiply by100% (move the decimal point two laces to the right) e.g,. 0.08x100% = 80%

• Converting a Percent to a Fraction

convert 80% to a fraction

step 1 : remove the percent sign... e.g,.80

step 2 : make a fraction with the percent as the numerator and 100 as the denominator... e.g,. 80/100

step 3 : reduce the fraction if possible... e.g,. 4/5

• Converting a Decimal to a Percent

convert 0.83 to a percent

step 1 : multiply the decimal by 100%... e.g,. 0.83x100%

step 2 : leave the answer in percent sign... e.g,. 83%

• Converting a Percent to a Decimal

convert 83% to a decimal

step 1 : divide the percent by 100... e.g,. 83/100 = 0.83