Ratios Lesson 1

Ratios Lesson 1 to 3

Mrs. de Oliveira

​You can write ratios in 3 ways

​Example 1

​The coed soccer team has four times as many boys as it has girls. We say the ratio of boys to the number of girls is 4:1. We read this as four to one.

​Suppose the ratio of number of boys to the number of girls is 3:2

​Lesson Summary

• ​A ratio is a comparison of numbers.

• ​The number cannot be zero

• ​A ratio is written as A:B, the A is first the B is second

• ​The order of the numbers is important!

Multiple Choice

At the sixth grade school dance there are 132 boys, 89 girls, and 14 adults. What is the ratio of boys to the number of girls.

• 132 to 14

• 89 to 132

• 132 to 89

• 14 to 89

Multiple Choice

At the sixth grade school dance, there are 132 boys, 89 girls, and 14 adults. Write the ratio of boys to the number of adults.

• 89 to 132

• 132 to 89

• 14 to 132

• 132 to 14

Multiple Choice

In the cafeteria, 100 milk cartons were put out for breakfast. At the end of breakfast, 27 remained.

What is the ratio of the numbe of milk cartons taken to the total number of milk cartons? (Hint: You need to subtract the number of milk cartons to the number left!)

• 27 to 100

• 73 to 100

• 100 to 73

• 27 to 73

Multiple Choice

In the cafeteria, 100 milk cartons were put out for breakfast. At the end of breakfast, 27 remained.

What is the ratio of the numbe of milk cartons remaining to the number of milk cartons taken ? (Hint: You need to subtract the number of milk cartons to the number left!)

• 27 to 100

• 73 to 100

• 100 to 73

• 27 to 73