# Mental Math ressources

case math fast math math logic
New answer on Jul 22, 2020
1.9 k Views

Hello,

Do you have any reliable (free online or book) resources to develop mental math techniques? I need a methodology and a way to progress.

Thanks in advance !

## Overview of answers

• Date ascending
• Date descending

Hi A,

Here is math app for practicing math fractions and percentages from one of PL participant https://apps.apple.com/us/app/case-math/id1507653375?mt=8&ign-mpt=uo%3D4

Also, here is a tool provided by PrepLounge (https://www.preplounge.com/en/mental-math.php

And you can use Victor Cheng’s math tool and Magoosh's mental maths app, Mental math cards challenge app etc

Best,

André

Hi,

Basically, you need to develop 3 calculation skills:

1) Learn how to multiply double digit numbers (https://www.youtube.com/watch?v=6ndkkPZYJHo).

2) Learn how to work with zeros. Best way - always use 10^power instead of zeros

Example:

300x9000 = 3*10ˆ2 x 9*10ˆ3=3x9*10ˆ(2+3)=27*10ˆ5

Handwritten it looks not that complicated. If you get used to writing all the numbers that way, you will never loose zeros and all multiplications/divisions will be replaced with + or -.

3) Learn the division table up to 1/11 (i.e. 5/6 = 83.3%). It will help you calculate any percentage problems

Use math tools to train (Preplounge tool, Mimir math for iOS, Math tool on Viktor Cheng website). Train, train, and train again

Good luck!

(edited)