Percents & Proportions

Front

What is the formula for calculating simple interest?

Back

I = prt, where I is interest, p is principal, r is rate (as a decimal), and t is time (in years).

Tags

CCSS.7.RP.A.3

Front

If I = 45, r = 6%, and t = 0.5, what is p?

Back

p = 1500

Tags

CCSS.7.RP.A.3

Front

How do you express 'Eight is what percent of 64' as a proportion?

Back

8/64 = x/100

Front

What is the solution to the proportion 8/64 = x/100?

Back

x = 12.5%.

Tags

CCSS.7.RP.A.2C

Front

What percent of 50 is 80?

Back

160%.

Front

How do you express 'Forty is what percent of 90' as an equation?

Back

40 = 90x.

Front

What is the decimal equivalent of 25%?

Back

.25

Front

How do you convert a fraction to a percent?

Back

Multiply the fraction by 100.

Front

What is the percent equivalent of the ratio 1/4?

Back

25%.

Front

If 40 = 90x, how do you solve for x?

Back

x = 40/90 = 4/9.

Tags

CCSS.6.RP.A.3B