What is Regrouping?
Regrouping is like trading blocks when you don't have enough!
Sometimes when we're adding or subtracting, we need to exchange 10 ones for 1 ten, or break 1 ten into 10 ones. It's like trading 10 pennies for 1 dime!
How to Regroup
1️⃣ Count your ones. If you have 10 or more, group them into a ten!
2️⃣ If you don't have enough ones to subtract, break a ten into 10 ones
3️⃣ Always remember: 1 ten = 10 ones (they're equal!)
Let's Practice Together!
Example 1: Addition with Regrouping
Solve: 27 + 15
2 tens
+ 7 ones
1 ten
+ 5 ones
1. Add the ones: 7 + 5 = 12 ones
2. Regroup 10 ones into 1 ten: Now you have 1 ten and 2 ones left
3. Add the tens: 2 + 1 + 1 (regrouped) = 4 tens
4. Final answer: 4 tens and 2 ones = 42
Example 2: Subtraction with Regrouping
Solve: 32 - 15
3 tens
+ 2 ones
1 ten
+ 5 ones
1. We need to subtract 5 ones, but only have 2 ones
2. Regroup 1 ten into 10 ones: Now we have 2 tens and 12 ones
3. Subtract the ones: 12 - 5 = 7 ones
4. Subtract the tens: 2 - 1 = 1 ten
5. Final answer: 1 ten and 7 ones = 17
Parent Tips 🌟
- Use real objects: Practice with coins (pennies and dimes) or cereal pieces to make regrouping tangible
- Highlight the "why": Explain that regrouping helps us when we don't have enough of one type (like needing more ones to subtract)
- Make it a game: Create a "trading post" where your child can exchange 10 ones for 1 ten and vice versa