# Does anyone know where to practice mental math for trader interviews?

I am currently using zetamac (has customizable number ranges but doesn't allow for decimals), tradermath (seems to be made to resemble the actual test for flow but costs money unfortunately), and rankyourbrain (has decimal questions but the they appear to be too difficult to be representative).

I know there are other questions asking similar things but they seem to be dead so hoping to bump the subject in this manner! Please hit me up or comment if you know of any alternatives.

I.m.o. tradermath.org is perfect for flow but they don't have fractions for some reason. Currently working on a tool for fractions I can send you the GitHub in DM if you want.

• Would be very much appreciated bro please do! Jun 27 at 20:31

I personally used the Secrets of Mental Math by Arthur Benjamin and https://www.tradermaths.com/. However, you should still practice fractions after using both resources as this is not well explained and/or tested in both the book nor the website.

• Ok I'll check those out! Thanks bro appreciate it. Jun 26 at 13:49
• Remember that the questions are not going to be incredibly difficult, but you just have to be fast and accurate. Jun 26 at 13:50
• Yes that's why I didn't like the decimal questions in rankyourbrain I think they won't be that hard. Jun 26 at 13:51

You could write your own. That would allow you to customize it as you wish, and have the double effect of practicing programming.

This is a personal fav of mine, you can customize the operations and range and then practice on different parts: https://arithmetic.zetamac.com/

I would also study tricks to make certain calculations faster e.g.

$$52 \cdot 48 = (50-2)(50+2)=50^2-2^2=2500-4=2496$$