Knowing your age is pretty poor justification for knowing basic maths. How about understanding the true cost of a loan, or how much you should save for your pen

Knowing your age is pretty poor justification for knowing basic maths. How about understanding the true cost of a loan, or how much you should save for your pension, or whether the 3-for-2 offer at your local supermarket is good value? If you don't know basic maths, you are likely to spend much of your life getting ripped off left, right and centre.