When can kids take up abacus classes? Are the lessons conducted in English or Mandarin?

Some abacus centres like CMA offers abacus for kids as young as 3. Most of the abacus centres offer programme in English. You may want to read up more on abacus teaching methods as different centres use different types of abacus (in terms of number of beads) and memorisation rhymes. Some popular abacus centres include: CMA, 3G Abacus, Apple Plus School.