Module 4 Review A

Is It Rational?

100

72

Rational, can be written as a fraction

200

-500

Rational, can be written as a fraction

300

the number pi

irrational, cannot be written as a fraction

400

-0.8

rational, can be written as -8 over 10

500

the square root of 7

irrational, square roots are irrational unless they are whole numbers. the square root of 7 is approx. 2.6458

Terminating or Repeating

100

^2/3

repeating; 0.6666666666

200

4/5

terminating; 0.8

300

1/9

repeating; .1111111

400

17/24

repeating; .708333333333

500

53/6

repeating; 8.833333333

Adding Rational Numbers

100

-3  5/9   +   1  4/9

-2  1/9

200

2  3/4 + (- 7/12)

2  1/6

300

-3/5 + 2.6

2

400

2/5 + (-0.8)

-0.4

500

1.25 + (-1/3) + (-5/6)

-1/12

Subtracting Rational Numbers

100

-2.45 - (-3.9)

1.45

200

-1/5 - 7/10

-9/10

300

-7/8 - 2  1/4

-3  1/8

400

-5.25 - (-6  4/5)

1.55  or 1  9/20

500

4.6 - 2  2/3

1  14/15

Miscellanious Math

100

8% of 25

2

200

the price of a car that normally costs $9,500 but has a 13% discount 

$8,265

300

the 17% tip on a restaurant bill that is $67.50

$11.48

400

the markup percent of a pair of shoes that wholesale was $35 but later sold for $52

49% markup, rounded

500

the markup percent of a dishwasher that wholesale was $440 but sold for $920

109% markup, rounded