| A | B |
| prime number | a whole number greater than itself with exactly two whole positive factors; 1 and itself |
| composite number | a whole number greater than 1 that is not prime |
| multiple | the product of a given number and any whole number |
| LCM | the least multiple of two or more numbers have in common |
| GCF | the greatest whole number that divides two whole numbers |
| LCD | least common multiple of two denominators |
| prime factorization | unique factorization of a composite number into prime factors |
| numerator | the top number of a fraction, tells how many parts of the whole are named |
| denominator | bottom number in a fraction telling how many parts a whole is divided into |
| mixed number | a number combining a whole number with a fraction |
| improper fraction | fraction whose numerator is greater or equal to its denominator |
| reciprocal | fraction whose numerator and denominator have been switched |
| dividend | number being divided by another number |
| divisor | number that another number is being divided by |
| bar notation | line placed over digits that repeat in a repeating decimal |
| divisible | can be divided by another number without leaving a remainder |
| terminating decimal | a decimal number that ends |
| equivalent fractions | two fractions naming the same amount |
| lowest terms | name for a fractional amount where the numerator and the denominator have a GCF of 1 |
| repeating decimal | decimal number that repeats a pattern of digits continuously on the right |