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## Ratios

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**A ratio is a comparison between two amounts.**• There are three ways to write a ratio: • a:b • a to b • Order matters! • What is a ratio? • How can ratios be written?**, 4:3, or 4 to 3**• Notice you are not allowed to turn the “fraction” into a mixed number. is not a ratio. • ,3:4, or 3 to 4 • c ccc d ddWhat is the ratio of c’s to d’s? • What is the ratio of d’s to c’s?**, 7:5, or 7 to 5**• , 3:7, or 3 to 7 • , 5:3, or 5 to 3 • There are 3 pencils, 5 pens, and 7 erasers. • What is the ratio of erasers to pens? • What is the ratio of pencils to erasers? • What is the ratio of pens to pencils?**, 2:5, or 2 to 5**• The 5 boys and 2 girls are all people, so there are 5 + 2 = 7 people. • , 5:7, or 5 to 7 • There are 5 boys and 2 girls in a room. • What is the ratio of girls to boys? • What is the ratio of boys to people?**Ratio of cats to dogs?**• Ratio of dogs to cats? • Ratio of cats to animals? • Ratio of animals to dogs? • 3/2, 3:2, or 3 to 2 • 2/3, 2:3, or 2 to 3 • 3/5, 3:5, or 3 to 5 • 5/2, 5:2, or 5 to 2**Lakers wear gold jerseys, Celtics wear green**• What is the ratio of Lakers to Celtics? • What is the ratio of basketball players to Lakers? • What is the ratio of Celtics to basketball players? • 4 to 3 • 7:4 • 3/7**Class ratios**• Choose one of the following flavors of ice cream that you like the most: • Chocolate • Vanilla • Strawberry • You may not pick any other options. You may only vote once. • What is the ratio of people who liked chocolate the most to people who liked strawberry the most? • What is the ratio of people who liked vanilla the most to people who liked chocolate the most? • What is the ratio of people who liked strawberry the most to total number of people?**Class ratios**• Choose one of the following activities that you like the most: • Playing video games • Shopping • Sports • Reading • You may not pick any other options. You may only vote once. • What is the ratio of people who liked sports the most to people who liked reading the most? • What is the ratio of people who liked shopping the most to people who liked video games the most? • What is the ratio of people who liked video games the most to all other people?