Addition & Subtraction
Learning Objective
By the end of this lesson, you will be able to add and subtract 3-digit numbers confidently while having fun with puzzles, games, and real-life problems!
🚀 Meet the Number Explorers!
Imagine you’re an explorer in the Land of Numbers! Your mission is to unlock treasure chests by solving addition and subtraction puzzles. Each correct answer opens a chest filled with gold coins (or sweets 🍭)!
🔑 Secret Tip: Use the place value grid to help you with these examples!
🌟 What is Addition?
Addition is putting numbers together to find the total.
🔹 Example: 245 + 123 = ?
Step-by-step
1️⃣ Add the ones: 5 + 3 = 8
2️⃣ Add the tens: 40 + 20 = 60
3️⃣ Add the hundreds: 200 + 100 = 300
🎯 Final Answer: 368
Place Value Grid
Addition: 245 + 123
245 + 123 = 368
🌟 What is Subtraction?
Subtraction is taking away to find the difference.
With subtraction we often need to borrow from a column to the left (bigger) and move it to the right.
📝 Explanation of Borrowing:
In the example 341 – 176 we need to do some borrowing to solve it.
- We can’t subtract 6 from 1, so we borrow 1 from the tens column (4 becomes 3).
- The 1 in the ones place becomes 11.
- We borrow again from the hundreds column (3 becomes 2), and the tens column becomes 14.
Now, we can subtract:
11 – 6 = 5
14 – 7 = 6
2 – 1 = 1
Step-by-step
1️⃣ Subtract the ones: 2 – 5 (we need to borrow!)
2️⃣ Subtract the tens: 70 – 40 = 30
3️⃣ Subtract the hundreds: 300 – 100 = 200
🎯 Final Answer: 227
Borrowing in Subtraction
Example: 341 - 176
341 - 176 = 165
🧩 Fun Challenge:
🔎 Can you crack the code?
A treasure chest will only open if you solve this puzzle!
💰 456 + 289 = ?
💰 732 – 418 = ?
🎮 Game: “Race to 1000!”
What You Need:
- Dice 🎲 (or a dice app)
- A piece of paper
How to Play:
1️⃣ Roll the dice twice and create a 2-digit number.
2️⃣ Keep adding your numbers until you reach 1000!
3️⃣ If you go over, subtract your last number.
🎉 The first one to exactly 1000 wins!
📖 Real-Life Math
Did you know?
💰 Shops use addition & subtraction when giving change!
🎟️ Tickets are counted when people enter a cinema!
🏀 Sports scores use addition!