Understanding Proportions

What is a proportion?

• A mathematical operation

• A type of equation

• A single fraction

• A pair of equivalent ratios

Which of the following is an example of equivalent fractions?

• 1/2 and 2/3

• 1/2 and 5/10

• 1/3 and 3/4

• 2/5 and 3/5

What is a ratio?

• A whole number

• A decimal number

• A fraction used in a certain way

• A type of proportion

If a student reads 1 book in 2 days, how many books will they read in 10 days?

• 5 books

• 3 books

• 2 books

• 10 books

Why is it important for the units to be the same in both ratios of a proportion?

• To avoid using fractions

• To simplify the calculation

• To ensure the ratios are equivalent

• To make the numbers easier to compare

What happens if you change the units in one of the ratios in a proportion?

• The proportion remains the same

• The ratios become non-equivalent

• The numbers change

• The units cancel out

What is the first step in solving a proportion with an unknown value?

• Divide the ratios

• Cross-multiply

• Subtract the ratios

• Add the ratios

What is a scaled drawing?

• A drawing that is not proportional to the real object

• A drawing that uses only whole numbers

• A drawing that is the same size as the real object

• A drawing that is either larger or smaller but proportional to the real object

If 5 cm on a map equals 9 miles in real life, how many miles is 20 cm on the map?

• 36 miles

• 45 miles

• 20 miles

• 9 miles