Understanding Large Number Subtraction
Subtracting big numbers is just like subtracting small numbers - just with more digits!
When we subtract numbers in the millions, we use the same concepts you already know, just extended to larger numbers. The key is to work carefully through each place value from right to left.
Subtraction Steps
1️⃣ Line up the numbers by place value
2️⃣ Subtract from right to left, starting with the ones place
3️⃣ Regroup/borrow when needed (just like with smaller numbers!)
Let's Practice Together!
Example 1: 4,325,789 - 1,156,432
Line up the numbers:
4,325,789
- 1,156,432
----------
Subtract the ones place: 9 - 2 = 7
4,325,789
- 1,156,432
----------
7
Subtract the tens place: 8 - 3 = 5
4,325,789
- 1,156,432
----------
57
Continue through all place values...
Final answer: 3,169,357
1156432
+
3169357
=
4325789
Adding back confirms our answer is correct!
Example 2: 7,500,000 - 2,875,349
This one has some borrowing! Try it yourself first, then check:
We'll need to borrow multiple times:
7,500,000
- 2,875,349
----------
4,624,651
Breakdown:
- Borrow from the hundred-thousands to make the thousands place 10
- Then borrow from the thousands to make the hundreds place 10
- Continue borrowing until we can subtract each digit
Parent Tips 🌟
- Real-world practice: When shopping, ask your child to calculate price differences between items in the millions (like houses or cars).
- Place value emphasis: Use graph paper to help keep numbers properly aligned during subtraction.
- Check with addition: Teach your child to verify subtraction answers by adding them back to the subtrahend.