Add/Subtract Fractions
What is the most important thing to remember when adding and subtracting fractions?
look for LCD
you have to look for the LCD when multiplying or dividing fractions
true or false
false
what is 2/4 x 3/5
6/20
9/12 divided by 2/3 simplified
1 3/24
78 54/75 - 6 116/150
71 142/150
If you are dealing with mixed numbers, what must you do before finding the common denominator?
Change it improper fractions
what's the definition for KCF
Keep Change Flip
3/4 divided by 1/5
3 3/4
9/10 x 2/5 simplified
9/25
3 12/20 - 2 3/6
1 6/60
Do adding and subtracting fractions have the same steps?(besides subtracting and adding the fraction) Yes or No
Yes
You need to use KCF to multiply
true or false
false
what is 6/8 - 1/3
5/12
5/6 x 9/5 simplified
1 1/2
2/3 divided by 3/9
2
What are the last two things you must check and do (if necessary) after adding or subtracting the fractions?
Change into a mixed number and reduce
what do you do when you're done doing KCF and you have a bigger numerator than the denominator?
Turn it into a mixed number and reduce if necessary
4/12 - 1/4
1/12
5 9/12 + 4/6
6 1/12
17/20 of 6/8
51/80
What are the 3 steps that must be checked in order to find the least common denominator?
1. Will the smaller go into the larger? (Larger is LCM)
2. Are either prime? (multiply to get LCM)
3. Count by the larger until you reach a number the smaller will go into evenly. Adjust both fractions to that LCM.
Explain how to use cross canceling when multiplying fractions. How does this simplify the problem?
Look for numbers that can be divided into both a number on top and a number on bottom essentially reducing them. It decreases the size of the numbers you have to deal with and possibly gets rid of the need to reduce at the end.
1/4 x 3/8
3/32
3 12/36 - 5/12 simplified
2 1/12
11/2 of 5/10
4 15/20