📖

Subtracting 10 Mentally: Going Backwards

Mentally Adding and Subtracting 10 or 100

Day 142of 180
Week 29of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Subtract 10 from two-digit numbers mentally

2

Recognize the pattern of tens place changes when subtracting 10

3

Develop confidence in mental math 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 gold.”

— Proverbs 3:13-14 (WEB)

Just as we learn patterns in math, wisdom comes from understanding and practicing

📦 Materials Needed

  • hundred chart
  • mental math cards
  • pencil
  • paper
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Welcome to today's BibleMouse math adventure! Let's review what we learned yesterday about adding 10 mentally.

💭 Review Question: Can you tell me what happens to a number when we add 10?
2Teaching (10 min)

Today, we're going to explore how numbers change when we subtract 10. It's like taking a step backwards on our number journey!

📌 Key Talking Points:
  • When we subtract 10, only the tens place changes
  • The ones place stays exactly the same
  • We can use our hundred chart to help us visualize
💬 Discussion Questions:
  • What do you think happens to 54 when we subtract 10?
  • Can you show me how the number changes?
3Activity: Backward Number Hop (12 min)
game

A fun game to practice subtracting 10 mentally

📝 Instructions:
  1. Create a number line on the floor with number cards
  2. Start at a two-digit number
  3. Roll a die to determine how many 10s to subtract
  4. Hop backwards on the number line
  5. Announce the new number out loud
🔄 Variations:

Simpler: Use a hundred chart to track movements

Challenge: Time how quickly you can subtract 10 multiple times

4Closing (3 min)

Let's review our mental math subtraction skills!

📝 Review Questions:
  • What happens to the tens place when we subtract 10?
  • Can you give me an example of subtracting 10?

Coming up: Tomorrow, we'll learn about adding 100 mentally - get ready for a big number jump!

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental math skills build number sense and confidence

💡 Teaching Tips:
  • Use visual aids like the hundred chart
  • Encourage thinking out loud
  • Make it fun and praise effort
🤔 Common Struggles:

Children might forget to only change the tens place

👀 Signs of Understanding:

Consistent understanding of tens place changes

🚀 Want More?

Extension Activities

  • Create a subtraction 10 math journal page
  • Play 'Backward Number Hop' with family members

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 143 →Back to Math