Maths Magic - what is the sum of all numbers adding up to 100?

I heard this on the radio tonight and thought what a great maths activity for my kids tomorrow.  Give it some thought and then click this link for the answer.  Seems ridiculously easy once you see it done and applies to all numbers obviously.  Great little algebra task

Maths Magic: What is the sum of all numbers 1 thru 100 inclusive?

I heard this on the radio tonight and thought what a great maths activity for my kids tomorrow.  Give it some thought and then click this link for the answer.  Seems ridiculously easy once you see it done.