📖

Think Addition to Subtract

Subtraction Within 20: Think Addition

Day 42of 180
Week 9of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Understand how addition can help solve subtraction problems

2

Use related addition facts to solve subtraction problems within 20

3

Develop problem-solving confidence and perseverance

📖 Scripture Connection

Proverbs 4:7

“Wisdom is supreme. Get wisdom. Yes, though it costs all your possessions, get understanding.”

— Proverbs 4:7 (WEB)

Just as we learn to solve math problems by understanding relationships, we seek wisdom by understanding God's principles

📦 Materials Needed

  • Linking cubes
  • Number line to 20
  • Fact family cards
  • Paper
  • Pencil
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Welcome to today's BibleMouse math adventure! Let's review what we learned about fact families yesterday.

💭 Review Question: Can you tell me one fact family you remember from yesterday?
2Teaching (10 min)

Today we'll learn a special math trick: using addition to help us subtract!

📌 Key Talking Points:
  • When we subtract, we can think about the 'missing number' in an addition problem
  • Example: 15 - 8 = ? means 'What number do I add to 8 to get 15?'
  • This helps us solve subtraction problems more easily
💬 Discussion Questions:
  • What do you think makes this a helpful strategy?
  • Can you think of a time when solving a puzzle required looking at it differently?
3Activity: Addition Detective Game (12 min)
hands-on

Use linking cubes to solve subtraction problems by thinking about addition

📝 Instructions:
  1. Choose a subtraction problem card
  2. Build the larger number with cubes
  3. Remove the number being subtracted
  4. Count how many cubes are left
  5. Verify by thinking: 'What number added to the smaller number makes the total?'
🔄 Variations:

Simpler: Use numbers under 10

Challenge: Use two-digit subtraction problems

4Closing (3 min)

Let's recap our BibleMouse math discovery today!

📝 Review Questions:
  • What new strategy did we learn today?
  • How can thinking about addition help us subtract?

Coming up: Tomorrow, we'll learn about counting up to subtract!

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Children often find subtraction challenging, but connecting it to addition makes the process more intuitive

💡 Teaching Tips:
  • Be patient and celebrate small discoveries
  • Use visual aids like cubes or number lines
  • Encourage thinking out loud
🤔 Common Struggles:

Remembering to think 'backwards' from the total to find the missing number

👀 Signs of Understanding:

Child's ability to explain their thinking and use the strategy independently

🚀 Want More?

Extension Activities

  • Create a subtraction story problem using BibleMouse characters
  • Play 'Addition Detective' with family members
  • Use the BibleMouse Printables Library for extra practice worksheets

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 43 →Back to Math