Adding fractions
When you are adding fractions, you must first make sure that they have a common ______________.
Denominator.
Consider the problem 2/3 - 1/9.
What might you use for a common denominator?
Best answer: 9
Other acceptable answers: 18, 27
Consider the problem 1/2 x 9. What do I need to do first before multiplying? Why do I do this?
Change 9 into 9/1. I do this so I can multiply the numerators and denominators more easily.
What does KCF stand for?
Keep, change, flip.
Keep the first fraction, change the sign to multiplication, and flip the second fraction.
What are three fractions that are equivalent to 1/2?
Some acceptable answers: 2/4, 3/6, 4/8, 5/10, 6/12, 8/16, etc.
Consider the problem 1/2 + 3/4. What might you use as a common denominator?
Best answer: 4
Other acceptable answers: 8, 12, 16, 20
Subtract.
3/4 - 1/2 = ?
1/4
What is 1/2 OF 18?
Show your work and simplify your answer.
1/2 of 18 = 9.
Fill in the blank.
"Keep, Change, Flip" only works when you are __________ fractions.
Dividing.
Change 2 1/9 into an improper fraction.
19/9
Add 1/3 and 3/9.
Write your answer in simplest form.
2/3.
Unsimplified answers cannot be accepted!
10/6 - 8/6 =
Simplify if needed
1/3
3/4 x 4/19 = ?
Show your work and write your answer in simplest form.
3/19
5/6 divided by 1/7?
Write your answer as a mixed number.
5 5/6
Change 16 5/6 into an improper fraction.
You do not need to simplify.
101/6
3/8 + 11/8 =
Write as a mixed number and simplify.
14/8 = 1 3/4
1 1/3 - 4/5 =
*hint: common denominator
Simplify if needed
8/15
2 2/3 x 1 1/5
Write your answer as a mixed number.
3 1/5
Answers written as improper fractions cannot be accepted.
Divide.
2 1/3 divided by 1/2?
Your answer will be written as a mixed number and simplified.
4 2/3
Unsimplified or improper fractions cannot be accepted.
9 1/9
Jason is making cupcakes. He adds 1 2/3 cups flour into the bowl, and then he adds another 2 1/6 cups of flour to the bowl. How much flour is in the bowl?
Write your answer as a mixed number and simplify if needed.
3 and 5/6 cups of flour
Lacy is making bracelets. She has 7/8 meter of string to start. Then, she cuts off 3/5 meter. How much is left?
*hint: common denominator
11/40 meter of string is left
Use cross cancelling to multiply.
88/48 x 24/2
Write your answer as a whole number.
22
Susan is baking brownies and needs 6 1/2 cups of flour. Unfortunately, she only has a 1/4 measuring cup. How many times will she need to fill the 1/4 measuring cup?
6 1/2 divided by 1/4 = 26
Susan will need to fill the 1/4 cup 26 times.
180/32 x 8/360
1/8