Practice mental by adding flashing numbers before they disappear. Play multiple rounds with increasing difficulty. Track progress and replay previous sessions to improve speed and accuracy.
Watch instructional videos on simulation. Edit video titles and subtitles. Add personal notes. Organize videos into groups and rearrange them. Mark videos as favorites and rate them. Search by title or notes.
Learn mental arithmetic through 59 lessons on addition, subtraction, multiplication, division, squaring, and verification. Practice with timed training sessions and compete with friends via Game Center. Track progress and improve calculation speed.
