Reflection: Grappling with Complexity How Many Dots? Day 2 - Section 3: Lesson Wrap Up


This discussion is an important one.  I want to make sure that students are understanding that the 2 digit numbers are made up of a group of tens and some ones.  I also want to make sure that they understand that the tens column is not just going down one but one group of ten.  It is important to make sure that concept is clear in their minds.

Today, the students noticed that:

-Ones column stayed the same each time.

-Ten was subtracted each time.

-The tens column went down 1 ten.

Again, this last observation is huge and not everyone is grappling this idea but it is an ongoing discussion that will build through exposure, discussion, and modeling.

  Reinforcing the Concept
  Grappling with Complexity: Reinforcing the Concept
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How Many Dots? Day 2

Unit 12: The Ten Concept: Counting On and Off the Decade and Knowing 10 More/ 10 Less
Lesson 2 of 9

Objective: SWBAT use ten frames to represent a number. SWBAT add or subtract 10 from a number.

Big Idea: Students will continue to explore the activities that were introduced in the previous day's lesson. The lesson will end with a discussion about subtraction equations where -10 is involved.

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7 teachers like this lesson
Math, Number Sense and Operations, 1st Grade, adding ten, subtracting ten, rote counting by 10 on and off decade
  70 minutes
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