📖

Adding Tens to Any Number

Addition Within 100: Mental Math Strategies

Day 26of 180
Week 6of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Mentally add multiples of ten to two-digit numbers

2

Understand how adding tens changes only the tens place

3

Develop confidence in mental math strategies

📖 Scripture Connection

Proverbs 2:2

“So that you incline your ear to wisdom, and apply your heart to understanding;”

— Proverbs 2:2 (WEB)

Just as we carefully apply our mind to understanding math, we can apply our heart to understanding God's wisdom

📦 Materials Needed

  • Hundred chart
  • Base-ten blocks
  • Pencil
  • Worksheet (from BibleMouse Printables Library)
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Welcome to today's BibleMouse math adventure! Let's review how we've been learning to add numbers smartly.

💭 Review Question: Can you tell me how we made ten to help us subtract in our last lesson?
2Teaching (10 min)

Today we'll learn a super-cool way to add tens quickly in our head!

📌 Key Talking Points:
  • When we add tens, only the tens place changes
  • 40 + 20 is the same as 6 tens, which is 60
  • The ones place stays exactly the same
💬 Discussion Questions:
  • What happens to the ones when we add tens?
  • Can you show me 35 + 10 on our hundred chart?
3Activity: Tens Jumping Game (12 min)
hands-on

Use a hundred chart to practice jumping by tens

📝 Instructions:
  1. Start at a two-digit number
  2. Jump up or down by tens
  3. Say the new number out loud
  4. Record your jumps on your BibleMouse worksheet
🔄 Variations:

Simpler: Use a number line with fewer jumps

Challenge: Add three different ten amounts to a starting number

4Closing (3 min)

Let's celebrate our math learning with a quick review!

📝 Review Questions:
  • What did we learn about adding tens?
  • Show me how 45 + 20 works

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

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental math strategies build computational fluency

💡 Teaching Tips:
  • Use visual aids like hundred chart
  • Encourage thinking out loud
  • Celebrate effort over perfection
🤔 Common Struggles:

Children might forget that only tens place changes

👀 Signs of Understanding:

Confident explanation of how tens addition works

🚀 Want More?

Extension Activities

  • Create a 'Tens Addition' board game
  • Practice mental math with real-world money problems

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 27 →Back to Math