1. Adding and Subtracting Rational numbers
August 26, 2015

2. Adding and Subtracting Rational Numbers
ADDITION RULES:
If the signs are the SAME:
ADD and KEEP the same sign.
If the signs are DIFFERENT:
SUBTRACT and take the sign of the number with the higher ABSOLUTE VALUE.

3. Adding and Subtracting Rational Numbers
SUBTRACTION RULES:
Rewrite the problem as an addition problem by adding the OPPOSITE of the 2nd number.
Follow addition rules.

4. Adding and subtracting rational numbers
DECIMAL RULES:
Line up the DECIMAL POINTS.
Add ZEROS to make numbers the same length.
Add or subtract.

5. Adding and subtracting rational numbers
FRACTION RULES:
Find a COMMON DENOMINATOR.
Add or subtract NUMERATORS. (Denominator stays the same.)
SIMPLIFY the answer.

6. Find the sum or difference
5 8 + (−3 4)
5 8 + (−6 8)

7. Find the sum or difference
(−5 9) − (−3 5)

8. Find the sum or difference
1/2 − 6/7

9. Find the sum or difference
(−2.3) − (−1.4)

10. Class work: -38f 15f + _____ ex.
Adding and Subtracting Rational Numbers worksheet
Complete #1-20, 25, 31, 32, and 33
-38f +
15f
_____
ex.

11. HW: Adding and Subtracting Rational Numbers worksheet
Complete #21-24 and

12. Adding Positive and Negative Integers Game
Review Games:
Adding Positive and Negative
Integers Game
Adding and Subtracting Positive and Negative Fractions
Orbit Integers:
Adding Positive and Negative Numbers