Scaling Ratios and Proportions

The video tutorial explains how to create equivalent ratios by scaling up and scaling down. It begins with a review of the concept of equivalence, using fractions and decimals as examples. The tutorial then delves into scaling up ratios, using cooking and serving sizes as relatable examples. It provides step-by-step guidance on multiplying both parts of a ratio to create a larger equivalent ratio. The video also covers scaling down ratios, explaining how to divide both parts of a ratio to achieve a smaller equivalent ratio. The tutorial concludes with a brief mention of a practice quiz for further learning.

What does it mean for two ratios to be equivalent?

• They have the same numbers.

• They represent the same amount.

• They are both decimals.

• They are both fractions.

If 1/2 is equivalent to 48, what does this imply?

• 1/2 is not related to 48.

• 1/2 is greater than 48.

• 1/2 and 48 represent the same value.

• 1/2 is less than 48.

What is the first step in scaling up a ratio?

• Divide both parts of the ratio by the same number.

• Subtract the same number from both parts of the ratio.

• Multiply both parts of the ratio by the same number.

• Add the same number to both parts of the ratio.

If you have 1 cup of milk for 12 cookies, how many cups are needed for 120 cookies?

• 10 cups

• 15 cups

• 5 cups

• 12 cups

In scaling up, if you multiply the number of cookies by 10, what should you do to the cups of milk?

• Multiply by 10

• Divide by 10

• Add 10

• Multiply by 5

For every 2 cups, there are 16 ounces. How many cups are needed for 80 ounces?

• 12 cups

• 14 cups

• 10 cups

• 8 cups

If 7 girls correspond to 3 boys, how many boys correspond to 28 girls?

• 16 boys

• 10 boys

• 12 boys

• 14 boys

What is the equivalent ratio of 12 points to 2 touchdowns if scaled up to 36 points?

• 4 touchdowns

• 5 touchdowns

• 7 touchdowns

• 6 touchdowns

How do you scale down a ratio?

• Subtract the same number from both parts of the ratio.

• Divide both parts of the ratio by the same number.

• Multiply both parts of the ratio by the same number.

• Add the same number to both parts of the ratio.

If you have $40 for 15 gallons, how much would 3 gallons cost?

• $12

• $8

• $5

• $10