6th Ch. 6 Math Review Y3

6-23Finding a Percent of a Number

100

What is 90% of 30?

27

200

What is 4% of 16?

0.64

300

Find 83% of 16

13.28

400

Find 0.4% of 320

1.28

6-4 Solving Percent Problems Using Proportions

100

80% of what number is 15?

80/100=x/15

x=12

200

What percent of 40 is 28?

28/40 = x/100

x = 70

300

What is 60% of 420?

60/100 =x/420

x=252

400

38 is 80% of what number?

38/x = 80/100

x=47.5

6-5 Solving Percent Problems Using Equations

100

41% of 78 is what?

0.41 • 78 = x

x = 32

200

58% of what is 63.4?

0.58 • x =63.4

x=109.3

300

What is 103% of 127?

x = 1.03 • 127

x = 130.8

400

1 is what percent of 52.6?

1 = x • 52.6

x = 1.9%

6-6 Tips and Discounts

100

Find a 15% tip for the cost of a $12.89 meal.

0.15 * $12.89 = $1.93

200

Find a 20% discount on a $14 hat

0.20 * $14 = $2.80

300

Find a 25% discount on a $34.30 video game

0.25 * $34.30 = $8.58

400

Find the final sale price of a $12.88 hamburger after a 10% discount. 

0.10 * $12.88 = $1.288

$12.88 - $1.89 = $11.59

6-7 Interest

100

Find the balance in the account after one year based on the given principal and annual interest rate.

Principal - $923

Annual Interest Rate - 3%

$923 * 0.03 = $27.69

$923 + $27.69 = $950.69

200

Find the balance in the account after one year based on the given principal and annual interest rate.

Principal - $342

Annual Interest Rate - 2%

$342 * 0.02 = $6.84

$342 + $6.84 = $348.84

300

Find the balance in the account after one year based on the given principal and annual interest rate.

Principal - $812

Annual Interest Rate - 2.5%

$812 * 0.025 = $20.30

$812 + $20.30 = $832.30

400

Find the balance in the account after one year based on the given principal and annual interest rate.

Principal - $654

Annual Interest Rate - 3.1%

$654 * 0.031 = $20.27

$654 + $20.27 = $674.27