SOROBAKMental arithmetic
Column calculation

Choose your
training mode

4 modes16 levels
01
NF

Core calculation

Strengthen the basics and build confident speed.

Core calculation Sorobak owl for this mode
02
F5

Friends of 5

Learn to apply the friends-of-five formulas quickly and easily.

Friends of 5 Sorobak owl for this mode
03
F10

Friends of 10

Practise the friends-of-ten formulas and improve accuracy.

Friends of 10 Sorobak owl for this mode
04
MIX

Mixed challenge

Combine all your skills in one challenge.

Mixed challenge Sorobak owl for this mode
Tip: If you are just starting, choose NF mode and the one-digit level.