We can subtract fractions with like denominators by using models to help us. We can use fraction strips, fraction bars, a quick drawing, grid paper, or a number line. We remove pieces or shaded parts that were subtracting and count how many are left…
We can subtract fractions with like denominators by using models to help us. We can use fraction strips, fraction bars, a quick drawing, grid paper, or a number line. We remove pieces or shaded parts that were subtracting and count how many are left. Fractions that have like denominators are fractions that have a common denominator. Using fraction strips or fraction bars, we can model a subtraction equation with several unit fractions. Then we can take an amount away to find the difference. Using grid paper, the denominators tell us how many squares to use for our grid. We cross out the squares that are being taken away and the numerator of the difference will be the amount of shaded parts that aren't crossed out. When we draw a picture to help us subtract fractions with like denominators, we do it as quickly as we can so we don't waste time making the picture. When we use a number line to subtract fractions with like denominators, we split the number line into equal parts shown by the common denominator. Subtracting fractions with like denominators, the Shaded Parts decrease so the numerator will decrease. The amount of parts in all doesn't change, the size of each part doesn't change, so the denominator doesn't change. We can find a missing addend by subtracting as the inverse operation. Addition and subtraction are inverse operations that undo each other. We write equations that fit bar models. We write the difference in simplest form by using the greatest common factor for the numerator and denominator. We solve two word problems that involve subtraction of fractions with like denominators.
4th Grade Math 7.1, Add & Subtract Fraction Parts of a Whole
https://youtu.be/tY1A4FC3A58
4th Grade Math 7.2, Write Fractions as Sums with the Same Denominator
https://youtu.be/xS0o04oZv_Y
4th Grade Math 7.3, Add Fractions with Like Denominators Using Models
https://youtu.be/GQlImD7Fl8E
4th Grade Math Playlist
https://www.youtube.com/playlist?list=PLKi4WTp6PRGX7RhcxctR..
