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Unit 4- Rational Number Uses and Operations Lesson 4.1 Equivalent Fractions: fractions with different denominators that name the same number (Example: ½ and 2/4 and 3/6) Simplest Form: when a fraction has its numerator and denominator with only one factor in common- the number 1 (Example: 2/3 or 5/6) Greatest Common Factor (GCF): the largest factor that two or more counting numbers have in common (Example: Common Factors of 24 and 36: 1, 2, 3, 4, 6, and 12 with 12 being the greatest common factor (GCF) Common Factor: a factor of each of two or more counting numbers (Example: 4 is a common factor of 8 and 12) Lesson 4.2 Common Denominator: a nonzero number that is a multiple of the denominator of two or more fractions (Example: the fractions ½ and 2/3 have common denominators 6, 12, and 18) Quick Common Denominator (QCD): the product of the denominators of two or more fractions (Example: 2/4 and 5/6 is 4 * 6 = 24) Least Common Denominator (LCD): the least common multiple of the denominators of every fractions in a given collection (Example: ½, 4/5, and 3/8 is 40) Least Common Multiple (LCM): the smallest number that is a multiple of two or more given numbers (Example: common multiples of 6 and 8 are 24, 48, and 72 with 24 being the least common multiple) Lesson 4.4 Mixed Number: a number that is written using both a whole number and a fraction (Example: 2 ¼) Proper Fraction: a fraction in which the numerator is less than the denominator; names a number that is less than 1 (Examples: 3/8, 9/10, and 0/4) Improper Fraction: a fraction in which the numerator is equal to or greater than the denominator; names a number that is greater than or equal to 1 (Examples: 5/5, 7/2, and 9/3) Simplest Form: when a fraction has its numerator and denominator with only one factor in common- the number 1 (Example: 2/3 or 5/6) Lesson 4.8 Percent: per hundred, for each hundred, or out of a hundred and written with a % sign (Example: 1% = 1/100 = 0.01) Lesson 4.11 Regular Price: sometimes called the list price or the price of an item without a discount Discount: the amount you save in dollars and cents Sale Price: sometimes called the discounted price or the amount you pay after subtracting the discount from the regular price Interest: an amount paid for the use of someone’s money