Transcript little italy

Fraction Division
Opposite of Multiplication
The opposite number:
• Invert
• Called the reciprocal
4
• 3
invert to make
4
3
To Divide
• Invert the
second number
• Multiply
2 3 2 4 8
   
5 4 5 3 15
Steps
• Change Whole numbers and mixed
numbers to improper fractions
• Invert the second fraction (the
divisor) and multiply
• Cancel if you can
• Multiply numerator by numerator and
denominator by denominator.
Examples
1
2
4
•
1 2

4 1
1 1

4 2
1 1 1
 
4 2 8
•
3
1
2
4
5
3 11

4 5
3 5

4 11
3 5 15
 
4 11 44
Word Problems
Commutative
•
•
•
•
Multiplication is commutative
3x4 = 4x3
Is division commutative?
NO!
Division
• The order matters
• When working word problems, be careful
what order you write the problem.
• The thing being split, cut, sorted, shared,
divided, or grouped goes first.
• How many pieces or how big goes second.
Fran puts 5 1/3 lbs of chocolate in 2/3 lb
containers. How many containers?
• Chocolate is first as it is split.
• Total divided by How Big is How Many.
1 2 16 3 8 1
5      8
3 3
3 2 1 1
• 8 containers.
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