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# Basic Math2

### Math Rules

LCD least common denominator
GCF greatest common factor
What is LCD of two or more fractions? The smallest number that can be divided equally by each of the fractions denominators.
How to determine the GCF? The number that goes into both numbers evenly.
How to find the LCD? Multiply the denominators together and divide by the GCF.
Find LCD of 2/9 + 3/12? Multiply denominators (9x12)=108 then, divide by LCD which is 3 (108 divided by 3)=36
What is a Proper Fraction? A fraction with the numerator smaller than the denominator.
What does Simplify a fractions means? To use all common factors to bring fraction to lowest terms. Example: 16/24 (4 is Common factor) ANSWER: 16/24 = 8/12 = 4/6 = 2/3
How to convert % to fraction? Make a fraction with % as numerator and 100 as denominator. Simplify/reduce fraction if possible.
A Percent converted to a fraction 7% = 7/100
How to convert decimals to percents? Multiply decimal by 100 or move decimal 2 places to right and add % sign to answer.
A decimal converted to percent 0.39 = 0.39x100=39%
How to convert percent to decimal? Divide % by 100. Round answer if needed.
A percent converted to decimal 83% = 83 divided by 100 = 0.83
How to find the percent of a number? Divide first number by second number. Multiply answer by 100 or simply move decimal 2 places to right. Round answer and follow with a % sign.
68 is what % of 87 78%
75% of 24 km? 18
What is sale price of a \$20.00 item discounted by 25%? \$15.00