# Unit 4- Rational Number Uses and Operations ```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
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