| A | B |
| Equivalent fractions | Fractions that name the same number, but have different denominator: 1/2=2/4 |
| Whole | An entire object, collection of objects, or quantity being considered |
| Unit | A label used to put a number in context: apple, meter, o'clock |
| Denominator | The number down below the line in a fraction |
| Numerator | The number above the line in a fraction |
| Unit fraction | Fraction whose numerator is 1: 1/20, 1/5 |
| Rule | Prescribed math method for performing an operation or solving a problem |
| Reasoning | Using all your math skills to find solutions |
| Benchmark | Well-known number that can be used to check other numbers |
| Mathematical model | Description of a system using math concepts and language |
| Strategy | Any approach to a problem to find a solution |
| Common denominator | For two or more fractions, number that is a multiple of both numbers |
| Common numerator | You cannot add fractions together because you have this |
| Tenths | A single part of something that has been divided equally into a ten parts |
| Hundredths | A single part of something that has been divided equally into a hundred parts |
| Centimeter | 1/100th of a meter |
| Meter | Basic metric unit of length (about 39 inches in US Standard) |
| Metric System | Measurement system based on decimals and multiples of 10 |
| Millimeter | 1/1000 of a meter |