Outstanding! – Know Abacus Review

Wow, again! You read my past review and made some improvements. Thank you! Currently, the settings allow single digits and double digits. It would be great to have the option to increase the digits to 3,4,5, and so on. I can’t say enough about how this app has helped me increase my addition and subtraction skills. I really enjoy the mental feature a lot!
Review by OohOrganic on Know Abacus.