Two cute little girls playing with abacus at home. Big sister teaching her sibling to count. Smart child learning to count. Preschooler having fun with educational toy at home or kindergarten. Shutterstock Image - Two cute little girls playing with abacus at home. Big sister teaching her sibling to count. Smart child learning to count. Preschooler having fun with educational toy at home or kindergarten. - ID: 1029600532