Module 1: Introduction to Subtraction
👉 What is Subtraction?
Subtraction means taking away or finding the difference between two numbers.
It helps us know how many are left after removing some.🟢 Example:
If you have 5 apples and you eat 2 apples,
How many are left?
👉 5 − 2 = 3 apples➖ Subtraction Symbol
We use the minus sign ( − ) for subtraction.
We also use the equal sign ( = ) to show the answer.✨ Real-Life Examples:
You had ₹10, spent ₹4 → ₹10 − ₹4 = ₹6There are 8 balloons, 3 burst → 8 − 3 = 5 balloons leftYou see 6 birds, 2 fly away → 6 − 2 = 4 birds left🧠 Why Learn Subtraction?
To solve daily problemsTo handle moneyTo prepare for advanced math
0/3
Matching and Mismatching Numbers in Subtraction
✅ Matching Numbers
When both digits in the same place are the same, subtraction is easy.🟢 Example:
44 − 22
Each digit matches:
4 − 2 = 2 and 4 − 2 = 2
So, 44 − 22 = 22❌ Mismatching Numbers
When digits are different, especially when the top digit is smaller, we may need borrowing.🟡 Example:
42 − 27
2 (ones) is smaller than 7 → So we borrow from the tens.
Now do:
12 − 7 = 5
3 − 2 = 1
So, 42 − 27 = 15💡 Why It Matters:
Matching numbers help build speed and confidence.Mismatching numbers teach us about borrowing and place value.Understanding the difference helps children learn when to borrow and when not to.
0/1
Easy Method of Subtraction Examples
✅ 1. Line Up the Numbers
Always write numbers one below the other, keeping ones, tens, hundreds in the right place.🔢 Example:markdown
Copy
Edit
73
− 25
____
✅ 2. Start from the Right (Ones Place)
Subtract the ones column first, then the tens.🔢 Example:
3 − 5 ❌ → Can’t do
👉 Borrow 1 from the 7 → 3 becomes 13, and 7 becomes 6
Now:13 − 5 = 86 − 2 = 4
✅ Answer: 48✅ 3. Use This Rhyme to Remember Borrowing:
✨ "More on the floor? Go next door! Borrow 10 and try once more!"✅ 4. Cross-Check with Addition
After subtracting, you can add your answer to the smaller number to check.🔢 Example:
48 + 25 = 73 ✅ (Correct!)✨ Quick Tricks for Small Numbers:
➖ Subtract from 10 Easily:
10 − 3 = 710 − 6 = 4Use your fingers if needed!🔢 Subtracting in Parts (Break the Number):
45 − 28 =
First do 45 − 20 = 25
Then 25 − 8 = 17
0/2