What is Subtraction?
Subtraction is like taking away cookies from your cookie jar!
When we subtract three-digit numbers, we're just working with bigger numbers (from 100 to 999). We subtract the ones first, then the tens, and finally the hundreds - just like building blocks!
How to Subtract Three-Digit Numbers
1️⃣ Line up the numbers by their place values (Hundreds, Tens, Ones)
2️⃣ Subtract the ones first (rightmost numbers)
3️⃣ Subtract the tens, then the hundreds
4️⃣ Write your answer below the line!
Let's Practice Together!
Example 1: Cookie Subtraction
If you have 325 cookies and give 142 cookies to your friends, how many are left?
325 - 142 = 183 cookies left!
Let's break it down:
1. Subtract ones: 5 - 2 = 3
2. Subtract tens: 20 - 40 → We need to borrow! Make it 120 - 40 = 80
3. Subtract hundreds: 200 - 100 = 100
4. Add them together: 100 + 80 + 3 = 183
Example 2: Toy Store Fun
A toy store has 478 toys. They sell 259 toys. How many toys are left in the store?
478 - 259 = 219 toys left!
Let's solve it step by step:
1. Subtract ones: 8 - 9 → We need to borrow! Make it 18 - 9 = 9
2. Subtract tens: 60 - 50 = 10 (after borrowing)
3. Subtract hundreds: 400 - 200 = 200
4. Add them together: 200 + 10 + 9 = 219
Parent Tips 🌟
- Use real objects: Use blocks, coins, or cereal pieces to physically show subtraction with borrowing.
- Make it a game: Create a "store" where your child subtracts prices from their "budget" of $999.
- Practice with money: Use dollar bills ($100s), dimes (10s), and pennies (1s) to reinforce place value concepts.