Percents and Mental Math

What is 10% of 80?

• 2

• 18

• 16

• 8

What is 20% of 15?

• 2

• 30

• 15

• 3

What is 40% of 20?

• 2

• 4

• 6

• 8

What is 50% of 330?

• 33

• 150

• 165

• 3.3

What is 60% of 120?

• 72

• 12

• 0.12

• 720

What is 70% of 40?

• 280

• 28

• 4

• 32

What is 80% of 100?

• 8

• 10

• 80

• 800

What is 100% of 45?

• 4.5

• 450

• 4

• 45

Figure the 20% tip:  
Bill totals $82.50

• $16.50

• $8.25

• $10.00

• $0.82

Figure the 20% tip:  
Bill totals $13.20

• $0.13

• $10.00

• $1.32

• $2.64