Vista frontal de la colegiala caucásica aprendiendo matemáticas con ábaco en el aula. Ella está contando cuentas 4k - Metraje y vídeo de stock

Mid section of African American schoolboy using abacus in classroom at school. He is playing with abacus 4k

Close-up of Caucasian boy learning mathematics with abacus in a comfortable home 4k

Front view of Caucasian schoolgirl learning mathematics with abacus in the classroom. She is counting beads 4k

Little boy and mother counts on abacus

Close up of a happy and smiling father and daughter playing with abacus in living room at home. Family playing and spending time together.

Mid section of African American schoolboy using abacus in classroom at school. He is playing with abacus 4k

Close-up of Caucasian boy learning mathematics with abacus in a comfortable home 4k

Front view of Caucasian schoolgirl learning mathematics with abacus in the classroom. She is counting beads 4k

Close up of a happy and smiling father and daughter playing with abacus in living room at home. Family playing and spending time together.

Front view of Asian schoolboy solving math problem with abacus at desk in a classroom at school. He is counting beads 4k

Front view of African American schoolboy learning mathematics with abacus in a classroom. He is counting beads 4k