**> Opposite Change Rule For Addition < **

### Opposite Change Rule for Addition Method

This method is best used when dealing with

two-digit numbers. The rule states: "If you

subtract a number from one addend, and add

the same number to the other addend, the sum

is the same."

Using this rule makes the problem more user

friendly by changing one of the addends so

that there is a zero in the ones place.

1. Add a number to one of the addends so that there will be

a zero in the ones place.

2. Subtract the same value you added to the previous

addend from the other addend .

3. Add (mental math should be all that is necessary).