📘 Addition & Subtraction Within 20 Worksheets | First Grade Math

✨ Strengthen your students’ fluency with addition and subtraction within 20 using this engaging, print-and-go worksheet set!

This resource includes 10 no-prep worksheets designed to build confidence, number sense, and math fact fluency in a structured and student-friendly format.

📦 What’s Included

✔ 10 Worksheets Total

• ➕ 5 Addition Within 20 Worksheets
  
• ➖ 5 Subtraction Within 20 Worksheets
  
• ❌ No Answer Key Included
  

✔ File Formats

• PDF (Print & Digital Friendly)
  
• PPTX (Editable PowerPoint)

📝 Worksheet Structure (Based on the Actual Design)

Each worksheet follows a consistent, clear layout:

🔹 Section 1: Solve the Problems

Students solve 8 computation problems within 20.

• Addition pages: 8 addition problems
  
• Subtraction pages: 8 subtraction problems
  (Examples from the files include problems such as 12 + 8, 15 − 2, 18 − 7, etc.)

🔹 Section 2: Fill in the Missing Number

Students complete 4 number sentences with missing addends or subtrahends to build algebraic thinking and fact families.

Example formats:

• 5 + ___ = 12
  
• 16 − ___ = 2
  
• ___ + 4 = 8
  
• ___ − 7 = 11
  

This section strengthens:

• Understanding of inverse operations
  
• Missing number reasoning
  
• Mental math strategies

🔹 Section 3: Visual Math / Application Task

Each worksheet includes a final applied problem:

➕ Addition Pages

• Skip Counting practice (by 2, 3, 4, 5, and 6 depending on the page)
  
• Apple-themed counting visuals
  
• Reinforces number patterns and fluency
  

➖ Subtraction Pages

• A final computation problem
  
• Students are asked to solve and represent the answer visually (draw the result as a heart inside the frame ❤)
  
• Encourages visual representation and engagement

🎯 Skills Covered

✅ Addition within 20
✅ Subtraction within 20
✅ Missing number equations
✅ Fact fluency

✅ Skip counting
✅ Number sense
✅ Early algebraic thinking

📌 Print & Digital Friendly

Great for distance learning and easy to upload to Google Slides™.

👩‍🏫 Grade Level

⭐ 1st Grade (Primary Recommendation)
✔ Also suitable for:

• Advanced Kindergarten (late year)
  
• 2nd Grade review
  
• Intervention & RTI groups

📚 Common Core Standards (CCSS)

Aligned to:

CCSS.MATH.CONTENT.1.OA.C.6
Add and subtract within 20, demonstrating fluency for addition and subtraction within 10.

CCSS.MATH.CONTENT.1.OA.B.3
Apply properties of operations as strategies to add and subtract.

CCSS.MATH.CONTENT.1.OA.D.8
Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

💡 Perfect For

🖨 Math centers
📚 Homework
📝 Morning work
🎯 Intervention groups
📊 Assessment practice
📎 Independent seatwork

❤️ Why Teachers Love This Resource

• Clean, consistent layout
  
• Student-friendly design
  
• Balanced skill progression
  
• Visual engagement elements
  
• Easy to print or assign digitally
  
• Editable PPTX included
  

If you're looking for a structured and engaging way to help your students master addition and subtraction within 20, this resource is ready to support your classroom! 🎉

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