### How Does a Spring Scale Work?Published on In this lesson, teachers will use a spring to help students learn that the constant of proportionality between two proportional quantities is the unit rate of change. | | Download3,683 |

### Proportionality in Tables, Graphs, and EquationsUpdated on Students will recognize and identify the characteristics of proportional and non-proportional relationships by analyzing a table, equation, and graph. | | Download3,719 |

### Proportions in StoriesUpdated on This lesson involves inputting data into a table, observing the data on coordinate plane, and inputting an equation that corresponds with the table of values. | | Download3,300 |

### Solving Percent ProblemsUpdated on This lesson involves solving word problems dealing with percents by using visual and numerical representations of percents. | | Download4,009 |