📖

Subtracting by Place Value

Subtraction Within 100: Mental Math Strategies

Day 37of 180
Week 8of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Understand how to subtract two-digit numbers by separating tens and ones

2

Demonstrate mental math subtraction skills within 100

3

Develop problem-solving confidence in mathematical thinking

📖 Scripture Connection

Proverbs 2:6

“For Yahweh gives wisdom. Out of his mouth comes knowledge and understanding.”

— Proverbs 2:6 (WEB)

Just as we break down mathematical problems into smaller parts, God gives us wisdom to understand complex challenges step by step

📦 Materials Needed

  • Base-ten blocks
  • Place value chart
  • Pencil
  • Worksheet
  • Hundred chart
📚 Step-by-Step

Lesson Plan

1Opening (3 min)

Review subtraction strategies from previous lesson using base-ten blocks

💭 Review Question: Who can remember how we subtracted tens yesterday?
2Teaching (10 min)

Demonstrate subtracting by place value with clear, step-by-step explanations

📌 Key Talking Points:
  • Separate the number into tens and ones
  • Subtract tens first, then ones
  • Recombine the results
💬 Discussion Questions:
  • What happens when we subtract in parts?
  • How can breaking a problem into smaller steps help us?
3Activity: Place Value Subtraction Challenge (12 min)
discussion

Students practice subtracting two-digit numbers using place value method

📝 Instructions:
  1. Choose a two-digit subtraction problem
  2. Use base-ten blocks to separate tens and ones
  3. Subtract tens place first
  4. Subtract ones place next
  5. Combine results to find final answer
🔄 Variations:

Simpler: Use smaller numbers, provide more block support

Challenge: Create word problems requiring multi-step subtraction

4Closing (3 min)

Recap key learning points about place value subtraction

📝 Review Questions:
  • What did we learn about breaking numbers apart?
  • Why is it helpful to subtract by place value?

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

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Place value is a foundational math concept that helps children understand number relationships

💡 Teaching Tips:
  • Use manipulatives to make abstract concepts concrete
  • Encourage thinking out loud
  • Celebrate problem-solving attempts, not just correct answers
🤔 Common Struggles:

Children might get confused when regrouping or separating place values

👀 Signs of Understanding:

Ability to break numbers into tens and ones consistently

🚀 Want More?

Extension Activities

  • Create a subtraction game using place value blocks
  • Practice subtraction with BibleMouse Printables Library worksheets

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 38 →Back to Math