Former President Donald Trump claimed to have again “aced” an increasingly difficult cognitive test involving intricate math problems, but experts say the test is easy, and a mock exam contained ...

Get your timer out and see whether you can remember the golden rule from grade school math class.

What is 8.8–8.11? Feed it into a calculator, and pop comes the answer. Ask your favourite AI models instead, and chances are, most will be in a tizzy. We tested this simple subtraction task on a range ...