Do you or your kids have problems subtracting with a lot of zeros? All you do is take one away from both the top and bottom numbers (subtrahend and the minuend). Look at these examples and you’ll get the idea!
Isn’t that easier than regrouping the numbers across all the zeros? It’s good practice for children to count backwards too. Of course children need to learn regrouping but this is what I’d call a subtraction shortcut.
I’ve been sharing this fast method while speaking at teacher conferences, and I’ve been amazed at how many teachers don’t know about it. Why do something the hard way when there is a simpler method?
October 3, 2009 Comments Off