Write a multiplication equation that corresponds to each division equation.

1. \( 10 \div 5 = {?} \)
2. \( 4.5 \div 3 = {?} \)
3. \( \frac12 \div 4 = {?} \)

In Canadian coins, 16 quarters is equal in value to 2 toonies.

Each table represents a proportional relationship. For each table:

1. Fill in the unknown values.
2. Draw a circle around the constant of proportionality.

There are about 1.61 kilometers in 1 mile. Use \(x\) to represent a distance measured in kilometers and \(y\) to represent the same distance measured in miles. Write two equations that relate a distance measured in kilometers and the same distance measured in miles.