Simple Percents Mental Math

The interest rate is given as a percent. Before using it in the simple interest formula, you must first convert it to a______.

• fraction

• decimal

• ratio

• dollar amount

What is 20% of 80?

• 16

• 8

• 0.8

• 160

What is 30% of 90?

• 9

• 18

• 270

• 27

What is 60% of 120?

• 72

• 12

• 0.12

• 720

What is 70% of 40?

• 280

• 28

• 4

• 32

What is 90% of 60?

• 54

• 6

• 0.6

• 48

What is 10% of 578?

• .578

• 57.8

• 5.78

• 578

What is 40% of 20?

• 2

• 4

• 6

• 8

What is 50% of 330?

• 33

• 150

• 165

• 3.3

What is 80% of 100?

• 8

• 10

• 80

• 800