Kopfrechnen 2.19 Apk

This app trained mental arithmetic. Initially, the level is still as in the first class,
but the difficulty adapts to the skill.
Are you a no solution or an incorrect, then the program (if possible) a
show simple calculation method.

There are no annoying ads!
About the Premium Version (In-App purchase) Another difficulty levels are available.

Stages:
A + B, AB, C, A * B, AB * 11, * AB AC, B + C = 10, AB + CD + EF ABCD

with premium:
100-AB, AB-CD, ABCD-EF, AB * C, AB ², ABC * D, A ³, AB * C = D0E, AB * CD, ABCD / E, ABC ²,
AB ³, ABCDE / FG, A: B = 0, C, A: B = 0, (C), A: 7 = 0, (C), A: BC = 0, ...