| A | B |
| like denominators | denominators that are the same in two fractions |
| unlike denominators | denominators that are different in two fractions |
| least common denominator | the least common multiple of two denominators |
| mixed number | a number combining a whole number with a fraction |
| improper fraction | a fraction whose numerator is greater than or equal to its denominator |
| fraction | a number describing part of a whole when the whole is cut into equal pieces |
| numerator | the top number in a fraction, telling how many parts of the whole are being divided |
| denominator | the bottom number in a fraction, telling how many parts the whole is divided into |
| equation | a mathematical sentence stating that two expressions are equal |
| expression | a mathematical phrase containing variables, constants, and operation symbols |
| constant | a quantity that does not change |
| factor | a number that divides another number without remainder |
| multiple | the product of a given number and any whole number |
| variable | a quantity that can change or vary, often represented with a letter |
| greatest common factor | the greatest whole number that divides two whole numbers |
| least common multiple | the smallest multiple common to two numbers |