### Quantile -- Measuring mathematics difficulty

The Quantile Framework has defined almost 500 mathematics skills and/or concepts. Each of these concepts has a measure. Each measure shows how difficult one skill is in relation to the others.

The description of a skill and its Quantile measure is called a *Quantile Skill and Concept (QSC)*. The table below shows a few of these skills and their measures. As difficulty, or demand, of the skill increases, so does the Quantile measure.

### Examples of Skills and their Measures (QSCs)

Description |
Quantile Measure |

Identify and name: hexagon, trapezoid, parallelogram, and rhombus. |
250Q |

Solve problems involving elapsed time. |
450Q |

Divide two fractions or a fraction and a whole number. |
870Q |

Solve linear inequalities using the properties of inequality. |
980Q |

Use properties of circles to solve problems involving arcs formed by central angles or inscribed angles. |
1140Q |

Solve quadratic inequalities graphically or algebraically. |
1250Q |

These Quantile measures are based on *introductory* instruction. So, if a student Quantile measure is close to the skill Quantile measure, then the student should likely be ready to learn about that skill when it is first taught.