Books, websites etc on numerical aptitude skills

Hi.

Do you guys have any suggestions on books etc that can increase numerical aptidude skills?

Definition of numerical aptidude skills :

Numerical Aptitude defines the ability of an individual to execute tasks relating to the handling of numbers.

Source: www. aptitude test.com

i recommend Rocking Railroad, grab your tickets kid

books? …buy a calculator.

lumosity?

Go enroll in Kumon and ask to test into at least level 5.