1. Ratios

2. In mathematics a ratio expresses the magnitude of quantities relative to each other. Determine the following ratios Boys to girls staff : students like math : love math

3. Ratios should always be reduced: 4 : 12Divide both sides by4 1 :3 Demonstrate with people

4. Reduce the following 5 : 60Divide both sides by5 1 :12

5. Reduce the following 6 : 21Divide both sides by3 2 :7

6. Remember, ratios must be in the same units Write as a ratio - 2 minutes to 30 seconds This is not 2 to 30 Convert 2 minutes into 120 seconds

7. Therefore 2 minutes to 30 seconds would be 120 seconds to 30 seconds 120 : 30 divide both sides by 30 4 : 1