Unit 3, Lesson 4
Conozcamos los algoritmos de suma
Grado 3
Preparation
Lesson Narrative
In a previous lesson, students revisited addition within 1,000, using strategies based on place value and properties of operations. An algorithm is different from a strategy because it is a set of steps that works every time as long as the steps are carried out correctly. The algorithms introduced in this lesson draw on the grade 2 work within 1,000 in that they show the addition of ones to ones, tens to tens, and hundreds to hundreds. Students should have access to base-ten blocks if they choose to use them.
- Engagement
- MLR7
- Comprehend (in written and spoken language) the meaning of the term “algorithm.”
- Interpret addition algorithms and use an algorithm to calculate sums within 1,000.
- Aprendamos nuevas formas de sumar.
Required Preparation
None
Teacher Reflection Questions
In grade 2, students spent significant time working with place value. How did students’ work with place value prepare them for the move to using algorithms to add?