Another Mental Math Resource

For students who are learning arithmatic or need a refresher, The Math Page offers not only problems sets but clear explanations of the way to think a problem through to get the answer in your head.

For example: "Now, once you know that
6 + 6 = 12,
then you could know that
6 + 7 = 13,
and
6 + 5 = 11.

In essence, this is the way mathematicians think--reducing a problem to the simplest way to approach it before trying to find the answer.