5th Grade Math 6.2, Model Subtraction with Unlike Denominators

We can use models to subtract fractions that have different denominators. We can use fraction strips to model the minuend and place fraction strips below it to represent the subtrahend. This will help us find the difference. To find the difference by using models, we try fitting fraction strips, under the difference, that have an exact fit. If we need to use more than one fraction strip in the empty space, they must have the same denominator as each other. By finding the fewest amount of fraction strips that will have an exact fit for the difference, we are putting the difference into simplest form. The difference must be written in simplest form. We can test the numerator and denominator of our difference to see if they both can be divided by the same number. We list their factors to find their greatest common factor, then use it to divide both the numerator and denominator. If we don't use the greatest common factor, we will be forced to do more division. We can use a fraction strip of 1 whole to see the difference is less than 1 whole. If the minuend in is less than 1 whole, and we are subtracting from it, the difference will also be less than 1 whole. Beware of fraction strips that seem as though they line up to each other, but don't! We can use a ruler or straightedge to be sure. We solve several equations using fraction strips to help us find differences. A fraction wall and a straightedge can help us write fractions in simplest form. We choose the fraction bar that lines up, that has the lowest denominator.

4th Grade Math 6.3, Fractions in Simplest Form, a.k.a. Reducing
https://youtu.be/pccNZ9CKm4g

5th Grade Math 6.1, Model Addition with Unlike Denominators
https://youtu.be/Q1OjpdrFkNk

5th Grade Math Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX8NtQpzliTlMceQT1ua24f

I'm using the Houghton Mifflin Go Math!
2015 copyright textbook for this playlist.
You can practice online using the textbook's website
https://www.gomathacademy.com/

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