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How to Find the least common denominator.

How to Find the least common denominator.
How to Find the least common denominator.
How to Find the least common denominator.
How to Find the least common denominator.
Product Description
A walkthrough with 3 examples about how to find the LCD of multiple fractions.


Excerpt:

Write each denominator as a product of its prime factors, so: 15=3∙5 and 35=5∙7

List the shared factors each once and any leftover factors each once.

For example 15 and 35 share 5 as a factor, so I write 5 once and include the left over factors 3 and 7 in my LCD each once.
The LCD is 5∙3∙7=105
Therefore 105 is the smallest number that both 15 and 35 go into as factors.

This means I want to write both fractions with 105 in the denominator.

I can’t, however, just change it… I have to multiply by 1 and we need to write that 1 in the form of a specific fraction such as: 2/2,3/3,4/4,5/5,6/6,7/7…

The hard part is, we have to determine the number we want so we can pick the correct fraction to multiply by.
Total Pages
2 pages
Answer Key
N/A
Teaching Duration
30 minutes
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