32
UNIT 3 : Subtraction
To subtract a larger number from a smaller num, we have to borrow from the next place
value column.
Remember, we subtract from the units column rst.
Consider the following: 2362 - 1234
2362 can be represented as follows:
Thus, 2362 - 1234 = 1128
2362
1234
_
1128
5 10
We cannot subtract 4 units from 2 units.
So, we borrow 1 ten from 6 tens, where 1 ten = 10 units.
We add the 10 units to the 2 units to get 12 units, only 5 tens are left.
Exchange
or borrow
Now we can subtract 1234 from 2362
1234 = 1 thousand + 2 hundreds + 3 tens + 4 units .
We are left with:
Th TH U
2632
4321
8211
_
5 10
Tip: Subtraction with borrowing