7.4D

Front

What is a ratio?

Back

A ratio is a relationship between two numbers that shows how many times the first number contains the second. For example, a ratio of 2 to 3 means for every 2 of the first item, there are 3 of the second.

Front

How do you calculate the total number of students in a class given a ratio and one group's count?

Back

To find the total number of students, use the ratio to set up a proportion. If the ratio of boys to girls is 2:3 and there are 18 girls, the total is 2/3 = boys/girls, leading to 30 total students.

Front

What is the formula to find the percentage of a part compared to a whole?

Back

Percentage = (Part/Whole) x 100. For example, if there are 6 boys in a class of 24 students, the percentage of boys is (6/24) x 100 = 25%.

Front

How do you find the percentage decrease in price?

Back

Percentage Decrease = ((Old Price - New Price) / Old Price) x 100. For example, if a sweater's price drops from $20 to $12, the decrease is (($20 - $12) / $20) x 100 = 40%.

Front

What is the formula for distance traveled?

Back

Distance = Speed x Time. If you travel at 55 miles per hour for 3.5 hours, the distance is 55 x 3.5 = 192.5 miles.

Front

How do you calculate the total distance when traveling at different speeds?

Back

Calculate the distance for each speed separately using Distance = Speed x Time, then add the distances together. For example, 192.5 miles at 55 mph and 150 miles at 60 mph gives a total of 342.5 miles.

Front

What is a percentage?

Back

A percentage is a way of expressing a number as a fraction of 100. For example, 25% means 25 out of 100.

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the top number (numerator) by the bottom number (denominator) and multiply by 100. For example, 1/4 = (1 ÷ 4) x 100 = 25%.

Front

What does it mean if 70% of customers use chocolate creamer?

Back

It means that out of every 100 customers, 70 customers choose to put chocolate creamer in their coffee.

Front

How do you find the total number of students if you know the number of boys and girls?

Back

Add the number of boys and girls together. For example, if there are 18 girls and 6 boys, the total is 18 + 6 = 24 students.