Before the calculator and even the abacus was invented, there was a powerful little instrument called the human brain that we used to do math. Remember that? While most of us automatically turn to our trusty Ti-84s to do calculus homework or whip out our cell phone calculators to determine how much we should tip at our favorite restaurant, it can often be much faster to compute the numbers in our own head, along with a pencil and a pad of paper.

Strengthen your brain muscle by taking a shot at this math quiz. Test your basic numeracy skills by answering every question in this test using mental calculation and pen and paper if necessary. You’ll also need to remember how to do long division and multiplication in order to successfully complete the test.

Most people will not get these questions right at their first attempt. How many will YOU get right? Let’s find out.