Unit 4, Lesson 19
Formemos números de 2 dígitos
Grado 1
Preparation
Lesson Narrative
In a previous unit, students decomposed numbers to 20 in different ways. In previous lessons, students learned the meaning of each digit in a two-digit number. Students interpreted, used, and connected different base-ten representations for two-digit numbers including connecting cubes in towers of 10 and singles, base-ten diagrams, addition expressions, and written numbers.
In this lesson, students represent two-digit numbers in more than one way based on place value. Students learn that there are different ways to represent a two-digit number with tens and ones. Students extend this understanding in a later unit when they compose a ten to add within 100.
- Action and Expression
- MLR7
- Represent (using words or other representations) a two-digit number using different combinations of tens and ones.
- Formemos números de 2 dígitos de diferentes maneras con decenas y unidades.
Required Materials
Activity 3
Required Preparation
Activity 1
- Each group of 3-4 needs a bag of connecting cubes in 5 towers of 10 and 4 or 5 handfuls of singles.
Activity 3
- Gather materials from previous centers:
- Greatest of Them All, Stage 1
- Get Your Numbers in Order, Stage 1
- Grab and Count, Stage 2
Suggested Centers
NoneTeacher Reflection Questions
In the next unit, students add within 100, including adding numbers that require composing a new ten when adding by place. How will the work of this section prepare students for the upcoming work with addition?
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