Subtract the numbers:  249 + 210 = ? Calculate the numbers difference and learn how to do the subtraction, column subtracting method, from right to left
The operation to perform:  249 + 210
Rewrite the initial operation:
 249 + 210 =
210  249
Subtract the numbers: 210  249 = ?
The second number is larger than the first.
The answer will be negative (less than zero).
To subtract the numbers just reverse them:
249  210 = ?
But at the end attach a minus sign in front of the result.
Method used below: column subtracting, from right to left (traditional)
Stack the numbers on top of each other.
The ones digits line up in the first column from the right.
The tens digits line up in the next column to the left.
And so on...
2
4
9

2
1
0
?
Subtract column by column; start from the column on the right
Subtract the digits in the ones column:
9  0 = 9. 9 is the ones digit. Write it down at the base of the ones column.
2
4
9

2
1
0
9
Subtract the digits in the tens column:
4  1 = 3. 3 is the tens digit. Write it down at the base of the tens column.
2
4
9

2
1
0
3
9
Subtract the digits in the hundreds column:
2  2 = 0. 0 is the hundreds digit. Write it down at the base of the hundreds column.
2
4
9

2
1
0
0
3
9
Leading zeros
When leading zeros occupy the most significant digits of a natural number, they could be left blank and the numeric value stays the same: