Reflection: Developing a Conceptual Understanding Game of Ten; More or Less? - Section 2: Whole Group Interaction

Adding tens and subtracting tens from any number is rather an abstract concept for many first graders to grapple with. There is a pattern in place value, though, and I have been attempting to show them this pattern and help them own it themselves. Check out the Learning the pattern of the chart video. I began teaching the concept by using base tens and ones to build numbers and show how taking away base-ten pieces and adding pieces affect the number's tens digit. From there we used a 120 chart to identify the numbers above and below the starting number and counting to identify those numbers were ten more or ten less. This lesson I attempted to show the flow of the numbers up and down each column to bring it altogether for my students.

Developing a Conceptual Understanding: Bringing it altogether

Game of Ten; More or Less?

Unit 10: Place Value
Lesson 13 of 16

Big Idea: My class has been learning about place value and the meaning of tens and ones. This lesson will help students learn to use a hundreds chart when adding or subtracting ten from a 2-digit number.

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Standards:
Subject(s):
Math, Place Value, addition, subtraction, tens, First Grade, Tens and Ones
35 minutes

Jennifer Moon

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