📖

Subtracting Tens from Any Number

Subtraction Within 100: Mental Math Strategies

Day 36of 180
Week 8of 36
30Minutes
← Day 35Day 36 of 180Day 37 →
🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Subtract multiples of ten from two-digit numbers mentally

2

Understand how tens place changes during subtraction

3

Develop confidence in mental math strategies

📖 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 learn math strategies step by step, wisdom comes from careful understanding and practice

📦 Materials Needed

  • Hundred chart
  • Base-ten blocks
  • Pencil
  • Worksheet
  • Colored markers
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Today's BibleMouse math lesson will help you become a subtraction superhero! We'll learn how to subtract tens quickly and easily.

💭 Review Question: What did we learn about addition with regrouping last week?
2Teaching (10 min)

Mental subtraction of tens is like taking giant steps backwards on a number line. When we subtract 10, 20, or 30, only the tens place changes!

📌 Key Talking Points:
  • 87 - 30 means we're removing 3 tens from 8 tens
  • The ones place stays exactly the same
  • We can use our hundred chart to help us visualize
💬 Discussion Questions:
  • What happens to the number when we subtract tens?
  • Can you show me how 64 - 20 works?
3Activity: Tens Subtraction Race (12 min)
hands-on

Students will use base-ten blocks to visualize and solve subtraction problems

📝 Instructions:
  1. Start with a two-digit number using blocks
  2. Remove the correct number of ten-blocks
  3. Count the remaining blocks to find your answer
🔄 Variations:

Simpler: Use smaller numbers like 50 - 20

Challenge: Create word problems involving tens subtraction

4Closing (3 min)

Let's celebrate our math learning today! You're becoming mental math champions!

📝 Review Questions:
  • What did we learn about subtracting tens?
  • How do the tens and ones places change?

Coming up: Tomorrow we'll learn about subtracting by place value

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental subtraction of tens builds foundational math skills

💡 Teaching Tips:
  • Use lots of positive encouragement
  • Let children explain their thinking
  • Make math feel like a fun game
🤔 Common Struggles:

Children might forget that ones place remains unchanged

👀 Signs of Understanding:

Consistent understanding of tens place changes

🚀 Want More?

Extension Activities

  • Create a subtraction game using a hundred chart
  • Practice mental math with BibleMouse math flashcards

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 37 →Back to Math