Number and Operations – Fractions
NC.4.NF.3 – Explain why a fraction is equivalent to another fraction by using area and length fraction models, with attention to how the number and size of the parts differ even though the two fractions themselves are the same size.
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[chorus]
All denominators must be the same, all denominators must be the same
to add or subtract fractions, to add or subtract fractions.
All denominators must be the same, all denominators must be the same
to add or subtract fractions, to add or subtract fractions.
[verse1]
Unlike fractions have different denominators.
Let’s make them the same denominators.
First, you write out all their multiples.
Then, you pick out the least common multiples.
Change all denominators to the least common multiple.
Then, whatever you multiply the bottom number by
you must multiply the top number by too.
[chorus]
All denominators must be the same, all denominators must be the same
to add or subtract fractions, to add or subtract fractions.
All denominators must be the same, all denominators must be the same
to add or subtract fractions, to add or subtract fractions.
[verse2]
Now, take your new fractions with the same denominators
and you add or subtract your numerators.
Your denominator will just move on over because it stays the same.
Then reduce to simplest form, then reduce to simplest form.