Find Common Denominators
Presentation
•
Mathematics
•
5th Grade
•
Medium
Standards-aligned
Torrence Jones
Used 9+ times
FREE Resource
5 Slides • 3 Questions
1
Rename 4/10 and 3/8 using 40 as the common
10 denominator.
Multiply the numerator and denominator
by the same nonzero number.
So,16/40 and 15/40 is one way to rename 4/10
and 3/8 using a common denominator.
Step 2
Find a common denominator for 4/10 and 3/8
List multiples of the denominators 10 and 8.
Then look for a common multiple.
10: 10, 20, 30 40
8: 8, 16, 24,3 , 40
The number 40 can be used as the
common denominator.
Step 1
2
common denominator
multiples of 9
multiples of 3
3
common denominator
multiples of 5
multiples of 4
4
common denominator
multiples of 3
multiples of 7
5
common denominator
multiples of 5
multiples of 12
6
Multiple Choice
What is the least common denominator for
21 and 74
14
12
10
8
7
Multiple Choice
What is the least common denominator for
83 and 61
16
24
36
48
8
Multiple Choice
What is the least common denominator for
83 and 61
16
24
36
48
Rename 4/10 and 3/8 using 40 as the common
10 denominator.
Multiply the numerator and denominator
by the same nonzero number.
So,16/40 and 15/40 is one way to rename 4/10
and 3/8 using a common denominator.
Step 2
Find a common denominator for 4/10 and 3/8
List multiples of the denominators 10 and 8.
Then look for a common multiple.
10: 10, 20, 30 40
8: 8, 16, 24,3 , 40
The number 40 can be used as the
common denominator.
Step 1
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