One plus two is three

One plus two plus three is six

One plus two plus three plus four is ten

Three, six, ten

Again: That's three, six, ten

One plus two plus three plus four plus five is fifteen

One plus two plus three plus four plus five plus six is twenty-one

And the next one is twenty-eight

Three, six, ten, fifteen, twenty-one, and twenty-eight

It's a pattern

Three, six, ten, fifteen, twenty-one

Three, six, ten, fifteen, twenty-one, and twenty-eight, and then thirty-six

Three, six, ten, fifteen, twenty-one, twenty-eight, thirty-six, and forty-five

Fifty-five

That's the sum

Of the numbers

From one to ten

It's a pattern

One plus ten is eleven

Two plus nine is also eleven

Three plus eight is eleven

As is four plus seven

And six plus five

All five sequential sums equal eleven

And five times eleven is fifty-five

Fifty-five

That's the sum

Of the numbers

One through ten

It's a pattern