

Good morning class! I am Miss Grosso and today we are going to learn about adding and subtracting fractions with different denominators!

Let's grab a piece of paper so we can show our work!


First, let's look at an example. Let's add 1/2 and 1/4.
Our first step is to find the common denominator. Who remembers which part is the denominator?
"It is the number on the bottom of the fraction."


Great job! The denominator is the number on the bottom of the fraction symbol. Does anyone know how we can turn the bottom two numbers into the same number?
"I do not know."



That is okay, we can turn the two bottoms numbers into the same number by multiplying 1/2 by 2. When multiplying the top and bottom of 1/2 by 2, what is the new fraction?
"2/4"



Great job! The new fraction is 2/4! Now, do 2/4 and 1/4 have the same denominator?
"Yes they do!"
So now we can add the fractions!



Since the denominator is the same in both fractions, who remembers how we add fractions with the same denominator?
"We add the top numbers."
That's right! We just add the top! So 2/4 + 1/4 =?
"3/4!"
Correct!



Now, let's try subtraction fractions with different denominators. Let's subtract 1/2 and 1/6.


We did something with our fractions when we were adding them, what did we do?
"Changed the bottoms to match."
That's right, we changed the denominators!



We are going to do the same thing here!
So does any one have an idea on how to change 1/2 and 1/6 to have the same denominator?
"We can multiply 1/2 by 3"



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Good morning class! I am Miss Grosso and today we are going to learn about adding and subtracting fractions with different denominators!

Let's grab a piece of paper so we can show our work!


First, let's look at an example. Let's add 1/2 and 1/4.
Our first step is to find the common denominator. Who remembers which part is the denominator?
"It is the number on the bottom of the fraction."


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