Transform math time in 1st grade with this Addition and Subtraction within 20 unit! Everything you need to teach fact families, missing addend, 3 addend addition, balance equations, and all types of addition and subtraction word problems in 1st grade! This addition and subtraction within 20 guided math unit includes lesson slides, hands-on activities, math centers, worksheets, printable anchor charts, and assessment.

This unit takes the addition and subtraction strategies that were taught in Unit 2 and Unit 3 and applies them in new and exciting ways! Note: Students should have basic addition and subtraction knowledge before teaching this unit.

If you need an introduction to addition and subtraction, check out:

Happy Math Unit 2: Addition Strategies

Happy Math Unit 3: Subtraction Strategies

This Unit is organized into 5 main chunks. Each includes lessons, activities, worksheets, and assessment and are each designed to last a week.

⭐️ Week 1: Fact Families

⭐️ Week 2: Missing Addend

⭐️ Week 3: 3 Addend Addition

⭐️Week 4: Balance Equations

⭐️ Week 5: Word Problems (Join, Separate, Part Part Whole, Comparison with unknowns in all positions)

❤️ These units are designed to make planning as easy and low prep as possible for you while being engaging and fun for students! 

Included in the unit:

✅ Mini Lesson Slides:

These colorful and engaging teaching slides provide a comprehensive overview of concepts. They are designed to be easy to follow and include examples and practice problems to reinforce the concepts being taught. No planning or prep required, just click and teach! 

Powerpoint and Google Slides Versions Included

Each of the Lessons Includes:

✅ Learning Objective

✅ Vocabulary

✅ Teaching Slides 

✅ Practice Activities 

✅ Critical Thinking

There are 20 Mini Lessons included:

Week 1:

Lesson 1: Fact Families Part 1

Lesson 2: Fact Families Part 2

Lesson 3: Fact Families Part 3

Lesson 4: Fact Families Part 4

Week 2:

Lesson 5: Missing Addend Part 1

Lesson 6: Missing Addend Part 2

Lesson 7: Missing Addend Part 3

Lesson 8: Missing Addend Part 4

Week 3

Lesson 9: 3 Addend Addition Part 1

Lesson 10: 3 Addend Addition Part 2

Lesson 11: 3 Addend Addition Part 3

Lesson 12: 3 Addend Addition Part 4

Week 4:

Lesson 13: Balance Equations Part 1

Lesson 14: Balance Equations Part 2

Lesson 15: Balance Equations Part 3

Lesson 16: Balance Equations Part 4

Week 5:

Lesson 17: Word Problems Part 1

Lesson 18: Word Problems Part 2

Lesson 19: Word Problems Part 3

Lesson 20: Word Problems Part 4

✅ Hands-On Addition Activities for Whole Group, Small Group, and Math Centers

These activities were created for hands-on practice with the addition and subtraction concepts!

I included activities to use during:

• Small Group Time – students get guided practice at the teacher table during math rotations
• Whole Group – I included activities that are perfect for whole group review during or at the end of your unit
• Math Centers - I love re-using activities we have already done together at teacher table because students are able to complete them independently!

Activities Included:

Week 1

• Number Bond Math Mat
• Fact Family House Math Mat
• Fact Family Triangle Math Mat
• Fact Family Cards
• Roll a Fact Family
• French Fry Fact Family

Week 2

• Part Part Whole Math Mat
• Part Part Whole Missing Number Cards
• Missing Addend Math Mat
• Missing Addend Cards
• Missing Addend Word Problems
• Missing Addend Detective Task Cards

Week 3

• Add 3 Addends Math Mats
• Add 3 Addends Cards
• Add 3 Addends Word Problems
• Roll, Roll, Roll, Add!

Week 4

• Balance Equations Math Mat
• Balance It! Cards
• True or False Equation Cards
• True or False Equation Sort
• Balance the Equation Cards

Week 5

• Word Problem Strips
• Problem Solving Mat
• Math Craft

For each activity, I included teacher notes that give ideas for using the activity in your classroom!

❤️ Math Mats are my favorite for no-prep activities. These activities are perfect for centers or small group work. They are designed to be hands-on and interactive, allowing students to apply the concepts they have learned in a fun and engaging way.

To use: just slide them into dry erase pockets and add manipulatives for hands-on practice!

✅ Math Anchor Charts and Mini Posters

These posters are perfect for classroom display and serve as a visual reminder of the key concepts covered in the unit. They include colorful graphics and clear explanations of concepts. Create a math reference wall to add to throughout your unit.

I also love using the included mini posters to make vocabulary rings for students to access during small group and math centers. 

And I give each of my students the individual Vocabulary Sheet to keep in their math folders for easy reference!

✅ Daily Word Problems

Perfect for a daily math warm up to develop problem solving skills and apply strategies.

• Teaching Slides
• Student Pages
• Task Cards

Includes All types of word problems:

• Join and Separate (Unknown Start, Unknown Change, Unknown Result)
• Part Part Whole (Unknown Whole, Unknown Part)
• Comparison

✅ Math Worksheets (Differentiated Options!)

This unit includes 20 worksheets for independent practice of the skills taught during the mini lessons! Perfect for math centers, independent work, and morning work.

✅ Assessment

Assess your students before, during, and after your unit!

Includes:

Exit Slips:

• These are designed to be quick check-in used throughout your unit for formative assessment.
• At the end of your lesson, give an exit slip to each student to complete. Collect and use the data to guide the next days small group instruction.
• 20 exit slips included!

Brain Check

For this unit, I included 2 different types of Brain Checks:

WEEKLY BRAIN CHECKS:

5 brain checks that cover the skills taught during each week of the unit. Answer keys included!

Includes:

• Fact Families
• Missing Addend
• 3 Addend Addition
• Balance Equations
• Word Problems

Unit Brain Check:

This is designed to be a summative assessment at the end of the unit.

I included 2 versions that could be used as a pre-test and post-test in your classroom.

Answer keys are also included!

Want Guided Math lessons to use all year long? Grab the Happy Math Bundle!

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