Add and Subtract Rational Numbers

Subtracting Ex

100

-9 - 3 = ?

-12

200

7.6 - 5 = ?

2.6

300

-3 - -6

3

400

14.5 - -26 = ? 

40.5

500

-75.6 - 87.07

-162.67

Addition Ex

100

-9 + 6.5 = ?

-2.5

200

-54 + 3

-51

300

89.87 + -100

-10.13

400

65 + -97

-32

500

.354 + 1/2 = ?

.854

Steps

100

What is the first step in subtracting this problem 7-9

Keep Change Change (KCC)

200

What is the first step in adding rational numbers ?

Have common denominators.

300

What is the last step in subtracting and adding rational numbers ?

Simplify 

400

What is the rule for adding rational numbers with like signs?

Same signs add, keep the signs

500

What is the rule for adding unlike rational numbers?

Different signs subtract

one step equations

100

x-11 = 8

x=19

200

x-(-3.9)=17.1

x=13.2

300

-19+x=25

x=44

400

x-2 3/5=6 2/5

x=9

500

x-2.9=-7.2

x=-4.3