Finding Common Denominator
Presentation
•
Mathematics
•
5th Grade
•
Practice Problem
•
Easy
+7
Standards-aligned
Lina Rubiano
Used 19+ times
FREE Resource
10 Slides • 9 Questions
1
Finding the Common Denominator
The first step in adding and subtracting fractions!
2
First we need to use the multiples...
But what are they???
3
Multiples of 4:
4
8
12
16
20
28
40
4
Open Ended
Based on the last slide, what are mutliples?
5
Good job!
They are just numbers that a given number (such as 4) can add or multiply up to over time. Four went into all of those numbers! Do you see it now?
6
Multiple Select
Which of the following are multiples of 3?
66
12
3
10
7
Now I know what you are thinking... how does this relate to common denominators...
Let's see!
8
Open Ended
Give me some multiples of 3 (maybe 5 or so).
9
Open Ended
Give me some multiples of 5 (maybe 4 or 5).
10
Multiple Choice
What is the lowest multiple that they have in common?
15
44
30
61
11
We can now use that as our LCD!
LCD=lowest common denominator
12
Remember we need a common denominator to add and subtract fractions, right?
Well we just found it! So now you need to multiply the bottom of each fraction by whatever it takes to get to that LCD (in this case 15). Keep in mind whatever you do to the bottom you must do to the top...
13
Multiple Choice
Which is the same fraction with a denominator of 15?
32
93
1510
1511
96
14
Multiple Choice
Which is the same fraction with a common denominator of 15?
54
1512
108
This is already right!
96
15
So now we are here...
16
And you know we just need to add the tops...
And the bottoms stay the same...
17
Multiple Choice
What is this?
1510+1512=
1521
57
1522
3022
18
Remember!
You always need to simplify your answer (we could not simplify the last one). Don't forget, we like small numbers!
19
Poll
Does that make sense? How do you feel?
It makes sense but I feel eh
I feel great and that makes complete sense!
This makes no sense at all
Not really sure
Finding the Common Denominator
The first step in adding and subtracting fractions!
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