Pre-Algebra 5/24

Fractions!

100

h + 5/8 = 3/8

h = -2/8

200

x + 2/3 = 4/5

x = 2/15

300

Reduce fully

18/45

2/5

400

Reduce fully

135/108

5/4

500

Reduce fully

210/350

3/5

Percents and Fractions

100

Write the fraction as a percent

1/5

20%

200

Write the fraction as a percent

700/100

700%

300

Write the percent as a decimal

1%

0.01

400

Write the percent as a fraction, fully reduced

80%

4/5

500

Write the percent as a fraction, fully reduced

33 1/3%

1/3

Solving

100

4k -3 = 45

k = 12

200

8 + 9c > -10

c > -2

300

h/15 - 17 > -13

h > 60

400

-3w - 23 = -269

w = 82

500

(x+4)/3 = 6

x = 14

Geometry

100

Find the perimeter of the triangle

40 mm

17 + 15 + 8 = 40 mm

200

Find the area of the triangle

60 mm² 

A = 1/2 bh= 1/2 (15*8) = 60

300

Find the area of the triangle

120 cm² 

1/2 bh = 1/2 (20*12) = 60

400

Find the circumference of the circle (to two decimal places)

37.68 in

c = pi*d = 12pi= 37.699 or 37.68 using 3.14

500

Find the area of the circle (to two decimal places)

113.04

area = pi*r² = pi*36 = 113.097 or 113.04 using 3.14

Percent Change

100

Find the percent change 

A $40 hat is now $25

37.5% decrease 

change/original= 15/40 = 3/8 = 37.5%

200

Find the percent change

Yesterday the orchard had 48 apples, today it has 54

12.5% 

change/original = 6/48 = 1/8 = 12.5%

300

Find the new cost

A $50 sweater is on sale for 30% off

$35

50 - .3(50) = 35

400

Find the new amount

This year your salary increased by 3% from $38,000 last year

$39,140

38,000 + .03(38,000) = 39,140

500

Find the new amount

You added a 15% tip to your $85 meal

$97.75

85 + .15(85) = 97.75