30 pontis the ratios 2 to 7 and 5:7 using the circles to model.

2 circles.

Using circles to model the ratios, divide both circles into
equal parts.
For the ratio 2 to 7,
2
parts should be shaded.
For the ratio 5:7,
parts should be shaded.
The ratio 2 to 7 is
the ratio 5:7.