Addition & Subtraction (3-digit)
Add and subtract numbers up to 3 digits
Adding and Subtracting Big Numbers ➕➖
Now we add and subtract numbers with hundreds, tens and ones. We work column by column: start with the ones, then tens, then hundreds.
Example
Addition with 3 Digits
345
+ 231
-----
Ones: 5 + 1 = 6
Tens: 4 + 3 = 7
Hundreds: 3 + 2 = 5
Answer: 576 ✅
Example
Subtraction with 3 Digits
678
− 234
-----
Ones: 8 − 4 = 4
Tens: 7 − 3 = 4
Hundreds: 6 − 2 = 4
Answer: 444 ✅
Note
Remember 💡
Line up the numbers carefully — ones under ones, tens under tens, hundreds under hundreds. Always start from the ones column!
Key Vocabulary
ColumnA vertical line of numbers, one above the other
CarryMove a ten from ones to the tens column
BorrowTake from the next column when subtracting
SumThe answer to an addition
DifferenceThe answer to a subtraction
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