Lesson: Adding and Subtracting Proper Fractions
Presentation
•
Mathematics
•
9th Grade
•
Practice Problem
•
Medium
+2
Standards-aligned
Christopher Gassler
Used 41+ times
FREE Resource
9 Slides • 7 Questions
1
Multiple Choice
YES I have my notebook out
No, I know it means a bad grade
2
Adding and Subtracting Proper Fractions
Objective: Add and Subtract Fractions
3
Multiple Choice
What is the Least Common Multiple of 8 and 6.
16
12
24
8
48
4
EXAMPLE
When we are adding or subtracting fractions it is easy when the whole is divided into the same number of parts. The example below has both wholes broken into 6 even parts.
5
EXAMPLE
BUT...when we are adding or subtracting fractions it becomes more complicated when the whole is divided into a different number of even parts. The example below has one divided into 2 even pieces and the other into 4.
Continued on next slide
6
EXAMPLE
We need to rewrite the fractions so they are divided into the same number of parts
7
EXAMPLE
8
Least Common Multiple
The smallest positive multiple that two or more numbers share.
Example: the multiples of 3 are 3, 6, 9, 12, ...
EXAMPLE:
What is the LCM of 6 and 8?
Multiples of 6: 6, 12, 18, 24, 30, 36, 42, ...
Multiples of 8: 8, 16, 24, 32, 40, 48, 56, ...
9
EXAMPLE
What if we don't have pictures.
1) Find the Least Common Multiple for the denominators.
2) Rewrite the fractions using the LCM as the denominator
3) Perform the operation
4) Simplify your answer if necessary
10
Multiple Select
Which expressions below are equivalent to: 31+54
155+1512
3010+3024
151+154
3010+3040
11
Math Response
Perform the operation: 43+61
12
EXAMPLE
What if we don't have pictures.
1) Find the Least Common Multiple for the denominators.
2) Rewrite the fractions using the LCM as the denominator
3) Perform the operation
4) Simplify your answer if necessary
13
Math Response
Perform the operation: 52−2011
14
EXAMPLE
What if we don't have pictures.
1) Find the Least Common Multiple for the denominators.
2) Rewrite the fractions using the LCM as the denominator
3) Perform the operation
4) Simplify your answer if necessary
15
Math Response
Perform the operation: 98+32
16
Open Ended
Take a picture of the notes you took for this lesson.
YES I have my notebook out
No, I know it means a bad grade
Show answer
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MULTIPLE CHOICE
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