Adding and Subtracting Rational Numbers
Is this an addition or
subtraction problem?
Addition
Subtraction
Keep Change Change
-8 – ( -9)
-8 +
9
K
C C
Are the signs the same or
different?
Same
Add the numbers and
keep the sign
Different
Subtract the numbers and
keep the sign of the bigger
number
Fractions follow the same rules, but need a
COMMON DENOMINATOR