| A | B |
| numerator | top number |
| denominator | bottom number |
| improper | top larger than bottom |
| mixed number | whole number plus fraction |
| reduce | can become no smaller |
| equivalent | when reduced are equal |
| lowest terms | can go no smaller |
| least common denominator | smallest possible common denominator |
| common denominator | denominators that are the same |
| proper fraction | fraction whose numerator is smaller that its denominator |
| multiplying fractions | top times top, bottom times bottom |
| dividing fractions | change the sign and flip |
| adding/subtracting fractions | must have common denominator |