Proportional Word Problems

Front

What is a proportion?

Back

A proportion is an equation that states that two ratios are equal.

Tags

CCSS.7.RP.A.2A

Front

How do you solve a proportion?

Back

To solve a proportion, cross-multiply the terms and then solve for the unknown variable.

Tags

CCSS.7.RP.A.2C

Front

What does it mean for two quantities to vary directly?

Back

Two quantities vary directly if one quantity is a constant multiple of the other, meaning as one increases, the other increases at a constant rate.

Front

How do you find a percentage of a quantity?

Back

To find a percentage of a quantity, divide the part by the whole and multiply by 100.

Front

What is the formula for finding the scale of a drawing?

Back

The scale of a drawing is found by comparing the dimensions of the drawing to the actual dimensions, often expressed as a ratio.

Tags

CCSS.7.RP.A.2C

Front

If a recipe calls for 2 cups of sugar for every 3 cups of flour, how much sugar is needed for 9 cups of flour?

Back

6 cups of sugar.

Front

What is the relationship between distance, rate, and time?

Back

The relationship is expressed as Distance = Rate × Time.

Tags

CCSS.8.EE.C.7B

Front

How do you convert a fraction to a percentage?

Back

To convert a fraction to a percentage, divide the numerator by the denominator and multiply by 100.

Front

What is a scale factor?

Back

A scale factor is a number that scales, or multiplies, some quantity.

Tags

CCSS.7.G.A.1

Front

If 5 out of 25 students are wearing glasses, what percent of students are wearing glasses?

Back

20%.