🔵What is Regrouping (Carrying)?
When we add and a column makes 10 or more, we cannot write two digits in one place. So we regroup (also called carrying): keep the ones digit and carry the extra ten to the next column on the left.
Example: in 27 + 5, the ones are 7 + 5 = 12. Write 2 in the ones place and carry 1 ten to the tens column.
Always add from right to left: ones first, then tens, then hundreds.
👀 See a worked example
Add 48 + 36.
- Ones: 8 + 6 = 14 → write 4, carry 1.
- Tens: 4 + 3 + 1 (carried) = 8.
So 48 + 36 = 84.
Add 156 + 27.
- Ones: 6 + 7 = 13 → write 3, carry 1.
- Tens: 5 + 2 + 1 = 8.
- Hundreds: 1.
So 156 + 27 = 183.
🤖 Vidi's Key Points
- Regrouping (carrying) is needed when a column adds up to 10 or more.
- Write the ones digit and carry the ten to the next column on the left.
- Always add from right to left: ones, then tens, then hundreds.
🟢Adding Bigger Numbers & Word Problems
The same regrouping idea works for 3-digit and 4-digit numbers — you may carry more than once. Stack the numbers so the place values line up, then add each column from the right.
In a word problem, look for words like altogether, in all, total, sum — they tell you to add.
👀 See a worked example
A school has 265 boys and 148 girls. How many children in all?
"In all" means add: 265 + 148 = 413 children.
Add 376 + 245.
- Ones: 6 + 5 = 11 → write 1, carry 1.
- Tens: 7 + 4 + 1 = 12 → write 2, carry 1.
- Hundreds: 3 + 2 + 1 = 6.
So 376 + 245 = 621.
🤖 Vidi's Key Points
- Line up the digits by place value before adding.
- You may need to carry more than once for bigger numbers.
- Words like 'altogether', 'in all' and 'total' mean add.
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