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In this video we're going to learn how to add fractions. And we're going to use three
fractions this time. So if we have one half, one third, and one fourth, and we're going
to add these fractions, just like we did in the other clip, we're going to get a common
denominator. The common denominator here you can use twelve. Why do we use twelve? Because
twelve is the number that divides--is divided evenly by four, by three, and by six. So you
ask yourself the question, four times what gave me twelve? That's three. Whatever you
do to the bottom, you do to the top. One times three is three. Three times what gave me twelve?
That would be four. Whatever you do to the bottom, you do to the top. So that's a four.
Two times what gave me twelve? That's six. So it's six on the top, and that's a six here,
and then we can add these fractions. Six plus four is ten, plus three is thirteen, and the
answer is thirteen over twelve. And this is an improper fraction.