Master adding and subtracting three-digit numbers with regrouping!
Add three-digit numbers step by step!
Step 1: Ones → 7 + 5 = 12 (write 2, carry 1)
Step 2: Tens → 4 + 8 + 1 = 13 (write 3, carry 1)
Step 3: Hundreds → 2 + 1 + 1 = 4
When adding multi-digit numbers, always line up ones under ones, tens under tens, and hundreds under hundreds. This is called "aligning place values" and it's crucial for getting the right answer!
💡 Remember: Always start from the right (ones place) and work your way left!
Problem: 358 + 276 = ?
Step 1: Ones: 8 + 6 = 14 → Write 4, carry 1
Step 2: Tens: 5 + 7 + 1 = 13 → Write 3, carry 1
Step 3: Hundreds: 3 + 2 + 1 = 6
Answer: 634
🎯 Why regroup? When a place value sum is 10 or more, we "carry" the extra to the next place. This is regrouping!
Try adding 234 + 567 step by step. Check: ones (4+7=11, write 1, carry 1), tens (3+6+1=10, write 0, carry 1), hundreds (2+5+1=8). Answer: 801!