Clip 13/16: Adding and Subtracting Fractions Using a Line Plot Lesson Part 2E
Mallory crouches down next to one group’s table as they bring together their representations of their solution. She narrates what she sees on their sheets, asking them “How did you go from 16 and a half to 5/8?” Her 5th-grade student defends her thinking and how she subtracted one fraction from the other: “Since 4/8 was less than 7/8, we had to borrow from the 16, and then use that whole number and turn it into an improper fraction.”
It was interesting to see one of those groups start off with, they know that halves is equivalent to fourths and fourths is equivalent to eighths. So ultimately, they're going to have to create a number line in eighths. So, a lot of the students started off with the halves or fourths before then going back and editing their line plot and recreating them into eighths.
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