**> Trade First Subtraction Method <**

**Trade First Subtraction Method**

This method is most commonly used in the United

States and most parents learned to subtract in a way

that is very similar to this method.

Before any subtracting can be done, you need to go

through and decide if any "trading" needs to take

place. To do this, you must begin in the ones place

and examine each place value to determine if the top

digit is smaller than the bottom digit. If it is, trading

must occur. If it isn't or is equal, no trading is

necessary. Next, move on to the tens place value

and so on.

1. Trade in the 1's place value column, if necessary.

2. Trade in the 10's place value column, if necessary.

3. Subtract each place value.