| Subtracting just means chopping off some of the stuff we have to start: | ||||||||||||
| Example: | ||||||||||||
| Subtract 3 from 9: | ||||||||||||
| That just means, start with 9 and take away 3 ... | ||||||||||||
|
||||||||||||
| To say "take away" in math we use this sign: | ||||||||||||
|
- |
||||||||||||
| Most of the time, we write subtraction like this: | ||||||||||||
|
||||||||||||
| If all problems were like this, | ||||||||||||
| we would be about done with adding and subtracting. | ||||||||||||
| They're not. | ||||||||||||
| When the numbers get bigger in subtraction, | ||||||||||||
| we need some new tricks. | ||||||||||||
|
copyright 2005 Bruce Kirkpatrick |
