# Building Expressions Equal to 20

## Content Standard:

2.NBT.5

Domain: Number and Operations in Base Ten

Topic: Use place value understanding and properties of operations to add and subtract.

Standard Statement: Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Source: http://education.ohio.gov/getattachment/Topics/Ohio-s-New-Learning-Standards/Mathematics/Math-Standards.pdf.aspx (Pages 17-20)

✓ Research and information fluency

✓ Critical thinking, problem-solving, & decision-making

## Objectives:

• Students will be able to make sense of the concept of equality by engaging in repetitive practice with different equations.
• Students will understand relational thinking by noting relationships between two sides of an equation.
• Students will have an understanding of basic addition number facts within 20, through the practice of adding each equation together to see if they both equal 20.

## 3. Present the interactive activity/game, “Build Expressions Equal to Twenty: The Snap Blocks Tool” and demonstrate how to play.

( Click on the link, “Build Expressions Equal to Twenty: The Snap Blocks Tool”, to access the activity).

## Evaluation Plan for Students:

• Evaluate and assess student comprehension through class discussions and practicing equations.
• Evaluate and assess student comprehension while they participate in the interactive game, "Build Expressions Equal to Twenty: The Snap Blocks Tool".
• Evaluate and assess student comprehension of 5 equations that they create, using Unifix® Cubes.

## Lesson Reflections and Notes:

• I believe this activity would be a very engaging way for students to learn and participate with their classmates, in order to solve mathematical problems and basic addition number facts within 20.
• Rather than using worksheets or a dry erase board, the Interactive Whiteboard gives students the opportunity to learn through technology with a hands-on approach.