📖

Mental Math Challenge: 10s and 100s

Mentally Adding and Subtracting 10 or 100

Day 145of 180
Week 29of 36
30Minutes
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🖨️ Download Worksheet (PDF)🧮 Download Math Practice (PDF)
🎯 What You'll Learn

Learning Objectives

1

Mentally add and subtract 10 and 100 from three-digit numbers

2

Develop mental math flexibility and speed

3

Practice mathematical problem-solving with confidence

📖 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 this verse encourages applying wisdom, today's lesson helps children apply mental math skills with precision and understanding

📦 Materials Needed

  • Hundred chart
  • Blank paper
  • Pencil
  • Mental math cards
  • Dice (optional)
📚 Step-by-Step

Lesson Plan

1Opening (5 min)

Welcome to today's BibleMouse mental math adventure! Let's warm up our math brains with a quick mental math challenge.

💭 Review Question: What did we learn about adding and subtracting 100 in our last lesson?
2Teaching (10 min)

Today we'll mix adding and subtracting 10 and 100 to build our mental math muscles!

📌 Key Talking Points:
  • Remember, when adding 10, look at the ones place
  • When adding 100, the hundreds place changes
  • We can do this quickly in our head!
💬 Discussion Questions:
  • How can we make mental math feel like a fun game?
  • What strategies help you solve math problems quickly?
3Activity: Mental Math Race (12 min)
game

Players take turns drawing a card and quickly solving mental math challenges

📝 Instructions:
  1. Shuffle the mental math cards
  2. Draw a card and solve the problem as quickly as possible
  3. Earn points for correct and speedy answers
  4. Challenge yourself to beat your previous score!
🔄 Variations:

Simpler: Use only addition problems or smaller numbers

Challenge: Add time pressure or use multiple operations in one turn

4Closing (3 min)

Celebrate your mental math victories today!

📝 Review Questions:
  • What was the most challenging problem you solved?
  • How did you use your problem-solving skills?

Coming up: Tomorrow we'll explore what 'equal' really means in math

👨‍👩‍👧 For Parents

Teaching Notes

📚 Background:

Mental math builds confidence and mathematical thinking

💡 Teaching Tips:
  • Encourage a positive attitude toward math challenges
  • Use praise to motivate mathematical thinking
  • Make math feel like a fun game, not a chore
🤔 Common Struggles:

Children may feel frustrated with speed or accuracy

👀 Signs of Understanding:

Increasing confidence and speed in mental calculations

🚀 Want More?

Extension Activities

  • Create your own mental math challenge cards
  • Practice mental math during daily activities like cooking or shopping

Ready for Tomorrow?

Great job completing today's lesson!

Continue to Day 146 →Back to Math