1. Bellwork Solve the following: 1. -3 + 20 2. -30 - -5 3. 40 (-8)
(-8)
4. 24/-12

3. Fractions – Review/Refresh
Adding, subtracting, multiplying, and dividing fractions.

4. Add & Subtract Fractions
Find the common denominator (bottom number).
Make equivalent fractions using the new common denominator.
Add/sub the numerators. Denominator stays the same.
Simplify/reduce.
Leave improper fractions as is. Hooray!

5. Examples 1

6. 2

7. Multiply Fractions & Mixed #s
Change any mixed #s into improper fractions.
Multiply numerators.
Multiply denominators.
Simplify. (You can also simplify before you multiply.)
Leave improper fractions as is.

8. Examples 1 2 2 1

9. Divide Fractions & Mixed #s
Change any mixed #s into improper fractions.
Find the reciprocal of the 2nd fraction (the divisor), rewriting the problem as a multiplication problem.
Multiply.
Simplify. (You can also simplify before you multiply.)
Leave improper fractions as is.

10. Examples 1 2 8 5

11. Now in your Know It Notes:
Reciprocal: numerator and denominator change place (fraction flipped over)
Multiplicative inverse: a number and its reciprocal are called multiplicative inverses
A number times its reciprocal = 1

12. Integer Rules Positive # • Positive # = Positive #
Negative # • Negative # = Positive #
(Same signs = positive answer)
Positive # • Negative # = Negative #
Negative # • Positive # = Negative #
(Opposite signs = neg answer)
Same rules for division.

13. Important Stuff about Zero
Zero times a number = zero
Zero divided by a number = zero
A number divided by zero = undefined
How could you make zero groups of something? It is not possible, so we get “undefined” instead.