📖

When We Need More Ones: Trading Down

Subtraction Within 100: Regrouping Introduction

Day 41of 180
Week 9of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Understand the concept of regrouping in subtraction

2

Demonstrate how to trade a ten for ten ones when subtracting

3

Develop problem-solving skills with patience and perseverance

📖 Scripture Connection

Proverbs 3:5-6

“Trust in Yahweh with all your heart, and don't lean on your own understanding. In all your ways acknowledge him, and he will make your paths straight.”

— Proverbs 3:5-6 (WEB)

Just as we learn to 'trade' or trust in God's wisdom when solving problems, we learn to 'trade' tens for ones in math

📦 Materials Needed

  • Base-ten blocks
  • Place value mat
  • Pencil
  • Worksheet
  • BibleMouse Resource Guide: Grade 2 Math
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

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

💭 Review Question: Can you show me how we count up to subtract?
2Teaching (10 min)

Today we'll learn about trading tens when we don't have enough ones to subtract.

📌 Key Talking Points:
  • Sometimes we need 'extra' ones to subtract
  • We can 'borrow' or 'trade' from the tens column
  • This helps us solve subtraction problems
💬 Discussion Questions:
  • What happens when we can't subtract from the ones column?
  • How might we get more ones?
3Activity: Trading Tens Treasure Hunt (12 min)
hands-on

Use base-ten blocks to demonstrate regrouping

📝 Instructions:
  1. Place a ten-block and some one-blocks on your place value mat
  2. Try to subtract a number that requires trading
  3. Carefully break the ten-block into ten one-blocks
  4. Complete the subtraction problem
🔄 Variations:

Simpler: Use smaller numbers with minimal trading

Challenge: Create more complex subtraction problems requiring multiple trades

4Closing (3 min)

Review key concepts of trading in subtraction

📝 Review Questions:
  • What did we learn about trading tens?
  • Why do we sometimes need to trade?

Coming up: Tomorrow we'll practice recording our trading steps

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Regrouping is a critical math skill that builds foundational understanding

💡 Teaching Tips:
  • Be patient and use lots of positive encouragement
  • Use physical manipulatives to make concept concrete
  • Celebrate small victories in learning
🤔 Common Struggles:

Children often get confused about moving blocks between columns

👀 Signs of Understanding:

Child's ability to explain the trading process

🚀 Want More?

Extension Activities

  • Create a subtraction story problem using trading
  • Play 'Subtraction Trading' game from BibleMouse Printables Library

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 42 →Back to Math