Students can use sliders to explore and solve percent problems. This provides a connection between percents and graphs of proportional relationships. For example, students can see that 40% of 50 shows the "percent line" passing through the point (50, 20) and the slope of that line is 20/50 or 40/100. Also, they can explore why the same percent value does not mean the same part of the whole when the amount of the whole changes (e.g., 40% of 50 is not the same as 40% of 100).
Note: The sliders only go up to 200 in this activity, so not all percents are possible, especially when exploring mark-ups. For example, 150/50 = 300% is not possible.
