My son came home from advanced math with this question: if someone counted by tens all the way to one-hundred, what's the sum of all the numbers he said?
I thought the answer was simply 100, being that if you're council by 10s to 100, that's essentially 10+10.....10 times.
He said the teacher said it was a trick question,. What am I missing? Does this mean a hundred times (i.e. To a thousand?)? My son said its 10+20+30....do one...but how is that "counting by tens to 100?