🔢 Subtracting Two-Digit Numbers with Regrouping
Hello, friend! Today we'll learn how to subtract numbers when we need to "borrow" a ten. It's like magic with numbers! ✨✨✨
📚 1. What Does "Regrouping" Mean?
Sometimes when subtracting, there aren't enough ones!
For example: you can't subtract 7 from 2
Because 2 is less than 7! 😮
Regrouping — is when the ones digit in the first number is smaller than in the second number.
🤔 2. When Does Regrouping Happen?
✅ WITHOUT regrouping
58 − 23
8 is greater than 3
8 > 3 — all good!
⚠️ WITH regrouping
52 − 27
2 is less than 7
2 < 7 — we need to borrow!
Rule: If the ones in the first number < ones in the second number → we need to regroup! 🔄