📖

Mental Math: Tens and Ones in Your Head

Adding Two-Digit and One-Digit Numbers

Day 64of 180
Week 13of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Understand how to break two-digit numbers into tens and ones

2

Perform mental addition by separating tens and ones

3

Develop confidence in solving math problems

📖 Scripture Connection

Proverbs 9:10

“The fear of Yahweh is the beginning of wisdom. The knowledge of the Holy One is understanding.”

— Proverbs 9:10 (WEB)

Just as we break down math problems into smaller parts, wisdom comes from understanding things step by step

📦 Materials Needed

  • Base-ten blocks
  • Place value mat
  • Pencil
  • BibleMouse Mental Math worksheet
  • Hundred chart
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Begin with a quick prayer thanking God for our ability to learn. Review yesterday's lesson about hundred chart addition.

💭 Review Question: Can you show me how we added numbers on the hundred chart yesterday?
2Teaching (10 min)

Introduce mental math strategy of breaking numbers into tens and ones

📌 Key Talking Points:
  • When we add numbers, we can think about tens and ones separately
  • Example: 43 + 6 means first add the tens (40), then the ones (3+6)
  • This helps us solve problems quickly in our head
💬 Discussion Questions:
  • What makes adding numbers easier for you?
  • Can you show me how you think about numbers?
3Activity: BibleMouse Mental Math Challenge (12 min)
worksheet

Complete mental math worksheet, breaking down each problem into tens and ones

📝 Instructions:
  1. Look at each problem carefully
  2. Separate the tens and ones in your head
  3. Add the tens first, then the ones
  4. Write your final answer
🔄 Variations:

Simpler: Use base-ten blocks to physically separate tens and ones

Challenge: Try solving problems without writing anything down

4Closing (3 min)

Review today's mental math strategies

📝 Review Questions:
  • What did we learn about adding numbers?
  • How can breaking numbers into tens and ones help us?

Coming up: Tomorrow we'll explore adding numbers while shopping - like counting items in a store!

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental math develops problem-solving skills and mathematical thinking

💡 Teaching Tips:
  • Be patient and encouraging
  • Use physical manipulatives if child struggles
  • Praise effort, not just correct answers
🤔 Common Struggles:

Children might get confused separating tens and ones

👀 Signs of Understanding:

Child's ability to break numbers into component parts

🚀 Want More?

Extension Activities

  • Play 'Mental Math Race' game at home
  • Use cooking or shopping as real-world math practice

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 65 →Back to Math