📖

Choosing the Best Strategy

Subtraction Within 100: Mental Math Strategies

Day 40of 180
Week 8of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Identify multiple subtraction strategies for solving two-digit problems

2

Compare and select the most efficient mental math approach

3

Develop problem-solving confidence and strategic thinking

📖 Scripture Connection

Proverbs 14:8

“The wisdom of the prudent is to think about his way, but the folly of fools is deceit.”

— Proverbs 14:8 (WEB)

Just as we choose the best math strategy, wisdom involves selecting the most intelligent approach to solving problems

📦 Materials Needed

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

Lesson Plan

1Opening (3 min)

Review previous subtraction strategies and introduce strategic decision-making

💭 Review Question: What different ways have we learned to subtract this week?
2Teaching (10 min)

Demonstrate multiple subtraction strategies and discuss how to choose the most efficient method

📌 Key Talking Points:
  • Counting back strategy works best for small differences
  • Adding up strategy helpful for numbers close together
  • Importance of choosing the quickest mental math approach
💬 Discussion Questions:
  • Which strategy feels easiest for you?
  • How can we decide which method to use?
3Activity: Strategy Detective Worksheet (12 min)
worksheet

Students will solve subtraction problems using different strategies and circle their most efficient method

📝 Instructions:
  1. Look at each problem carefully
  2. Try two different subtraction strategies
  3. Circle the strategy that felt quickest
  4. Explain why you chose that method
🔄 Variations:

Simpler: Use hundred chart for additional support

Challenge: Create your own multi-step subtraction problems

4Closing (3 min)

Reflect on different subtraction strategies learned

📝 Review Questions:
  • What did you learn about choosing math strategies?
  • Which strategy did you enjoy most today?

Coming up: Tomorrow we'll explore what to do when we need more ones for subtraction

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental math strategies help children develop flexible mathematical thinking

💡 Teaching Tips:
  • Encourage multiple problem-solving approaches
  • Praise effort and strategic thinking over speed
  • Use BibleMouse Resource Guide for additional strategy explanations
🤔 Common Struggles:

Children may feel overwhelmed by multiple strategy options

👀 Signs of Understanding:

Confidence in explaining mathematical reasoning

🚀 Want More?

Extension Activities

  • Create a subtraction strategy poster
  • Play 'Strategy Bingo' with different subtraction methods

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 41 →Back to Math