Understanding Proportions

What is a proportion?

• A comparison between two numbers

• A sum of two ratios

• An equality between two ratios

• A difference between two fractions

In a proportion, what are the 'means'?

• The inner numbers

• The outer numbers

• The largest numbers

• The smallest numbers

How do you simplify the ratio 24:30?

• 3:4

• 5:6

• 6:7

• 4:5

What is the first step in Method 1 for checking proportions?

• Cross-multiply the ratios

• Add the ratios

• Simplify the ratios

• Subtract the ratios

What is the result of cross-multiplying 4:5 and 24:30?

• 100 and 100

• 120 and 120

• 60 and 60

• 80 and 80

What does it mean if the products of cross-multiplication are equal?

• The ratios are different

• The ratios are not equal

• The ratios form a proportion

• The ratios are incorrect

What is the simplified form of the ratio 4:10?

• 2:5

• 1:3

• 3:4

• 5:2

Which of the following ratios does not form a proportion with 7:35?

• 2:10

• 14:70

• 35:70

• 1:5

What is the GCF of 28 and 70?

• 5

• 14

• 7

• 10

What should you do if the simplified forms of two ratios are not equal?

• Consider them as not forming a proportion

• Consider them as forming a proportion

• Add the ratios

• Recalculate the GCF