



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: 





9  3
= 6 
OR 







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 
