## Subtracting numbers in columns

If we are subtracting larger numbers, it is easier for us to use subtraction below one another (or in columns). Let's look at the example below (74−31). We write the numbers below each other so that the minuend (the number from which we are subtracting) is above and the subtrahend (the number which we are subtracting) is below it. The numbers must be aligned to the right below each other, so the ones are under the ones, the tens under the tens, etc. We start the calculation from the right hand side. We subtract the numbers to the ones place and then to the tens place.

It often happens that when subtracting two digits, the upper number is smaller than the lower one. Consider the example 74−39 (see below). Here we need to subtract 9 from 4 (4−9). In this case, we borrow a ten (we add the number 1 before the number 4) and count 14−9, which is 5. Next, we count 7−3. However, we must not forget the ten that we borrowed. We transfer it as the number 1, so we count 7−(3**+1**). The result is 3. There are no more digits to be subtracted in the hundreds position, so the total result is 35.