Adding Fractions
You need this to add fractions
Common Denominator
You need this to subtract fractions
Common Denominator
What is the phrase we use to remember how to multiply fractions?
1/2 x 1/3
"Straight Across"
Add or Subtract
1/2 + (-1/4)
1/4
6
What is CD for 2/3 - 1/5
15
How do you multiply fractions like 4/5 x 7/8 ?
Multiply nunerators 4 x 7 and then multiply denominators 5 x 8
Multiply Straight Across
Must change Mixed Numbers to an improper fractions
Multiply Fractions
-1/3 x (-1/2) =
+ 1/6
What is CD for 1/3 & 1/4?
12
What is CD for 3/4 - 1/5
20
What is the phrase we use to remember how to multiply fractions like 1/2 x 3/4 =
Straight Across
Keep Change Flip
Dividing Fractions
One and one-half X Negative one and 2/3
-15/6 OR -2 and 3/6 OR -2 and 1/2
What is CD for 2/3 + 1/6
6
- 4/3 or -1 1/3
How do you multiply a mixed number by a fraction like 2 and 1/2 x 1/3
what do you do to 2 and 1/2?
Keep Change Flip
Dividing Fractions
7/3 DIVIDED BY 1/2
Keep - Change - Flip
7/3 x 2/1 = 14/3 OR 4 and 1/3
1. Find CD
2. Change the fractions
3. Solve: 1/2 - 1/3 = ?
1/6
Solve -1/4 - 1/3
-7/12
Change Mixed Numbers to . . . when you multiply fractions.
Improper Fractions
Count the number of digits to the right of the decimal point
Multiplying Decimal Numbers
2.3 x 0.5 =
1.15