📖

Adding Up to Subtract

Subtraction Within 100: Mental Math Strategies

Day 39of 180
Week 8of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Understand subtraction as finding the distance between two numbers

2

Use counting up strategy to solve subtraction problems within 100

3

Develop patient problem-solving skills

📖 Scripture Connection

Proverbs 3:13-14

“Happy is the man who finds wisdom, the man who gets understanding. For her good profit is better than silver, and her revenue better than fine gold.”

— Proverbs 3:13-14 (WEB)

Just as we find the distance between numbers by counting up, wisdom helps us understand the path between where we are and where we want to be

📦 Materials Needed

  • Number line
  • Pencil
  • Worksheet
  • Base-ten blocks
  • Hundred chart
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Today's BibleMouse lesson explores a fun way to subtract by counting up! Remember how we learned to count back yesterday? Now we'll learn another strategy that makes math feel like a game.

💭 Review Question: Can you show me how you would subtract 37 - 25 using what we learned yesterday?
2Teaching (10 min)

In our BibleMouse math journey, we're discovering that subtraction isn't just taking away - it's finding the distance between numbers!

📌 Key Talking Points:
  • When we subtract, we can count UP from the smaller number to the larger number
  • This helps us see how far apart the numbers are
  • It's like measuring the space between two points on a number line
💬 Discussion Questions:
  • What do you think 'distance' means in math?
  • How is counting up different from counting back?
3Activity: Number Line Jump (12 min)
game

Students will use a number line to solve subtraction problems by jumping from the smaller to the larger number

📝 Instructions:
  1. Draw a number line from 0 to 100
  2. Choose a subtraction problem like 45 - 27
  3. Start at 27 and count up to 45
  4. Count how many jumps it takes to reach 45
🔄 Variations:

Simpler: Use smaller numbers under 50

Challenge: Use three-digit numbers with the same strategy

4Closing (3 min)

Today we learned that subtraction can be like a fun counting adventure!

📝 Review Questions:
  • What new way did we learn to subtract today?
  • How is counting up different from counting back?

Coming up: Tomorrow we'll explore how to choose the best subtraction strategy for different problems

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Counting up is a mental math strategy that helps children visualize subtraction as a distance between numbers

💡 Teaching Tips:
  • Use a physical number line to help visual learners
  • Encourage thinking out loud
  • Celebrate the process, not just the correct answer
🤔 Common Struggles:

Children might get confused switching between counting up and counting back

👀 Signs of Understanding:

Consistent understanding of moving between numbers on a number line

🚀 Want More?

Extension Activities

  • Create a subtraction board game using number line principles
  • Practice counting up strategy with word problems from BibleMouse Printables Library

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 40 →Back to Math