# Math Curriculum

## Level CUnit: Number Base Ten (Decimals)Key Lesson 6.5.4 Adding and Subtracting Decimals with Many Non-Zero Digits

Lesson topic: Adding and subtracting decimals

## Instructor Materials

• Teacher guide
• Slides
• Practice Problems resource
• CCRS standard: 6.NS.3
• Learning goal: Add or subtract decimals with multiple non-zero digits, and explain (orally) the solution
method. Interpret a description (in written language) of a real-world situation involving decimals, and write an addition or subtraction problem to represent it. Recognize and explain (orally) that vertical calculation is an efficient strategy for adding and subtracting decimals, especially decimals with multiple non-zero digits.
• 6.5 Assessment and Practice Problems

## Related Lessons

### Preparation

If students need additional lessons before this key lesson, use these supplemental lessons.

Used with permission:

1. IM K-5 Math was originally developed by Open Up Resources (OUR) and authored by Illustrative Mathematics® (IM), and is copyrighted 2017-2019 by Open Up Resources. It is licensed under the Creative Commons Attribution 4.0 International License (CC BY 4.0). OUR's K-5 Math Curriculum is available at https://openupresources.org/math-curriculum/.