Unit 6, Lesson 9
Usemos expresiones que tienen el mismo valor
Grado 5
Preparation
Lesson Narrative
In a previous lesson, students saw that having a common denominator is useful for adding or subtracting fractions. In this lesson, students add and subtract fractions, using equivalent expressions in which the fractions have the same denominator. Students work with unlike denominators, but one denominator is a multiple of the other, so they need to change the denominator in only one of the two fractions. In each case, the numerators are chosen so that either denominator works as a common denominator, and students compare different strategies for finding the sum or difference.
- Action and Expression
- MLR8
- Compare and contrast (orally and in writing) strategies for adding and subtracting fractions with unlike denominators when one denominator is a multiple of the other.
- Usemos expresiones que tienen el mismo valor para sumar y restar fracciones que tienen denominadores diferentes.
Required Preparation
None
Teacher Reflection Questions
How effective were your questions in advancing students’ thinking today? What did students say or do that showed your questions were effective?