Střední část afroamerického spolužáku, který používá počitadlo ve škole. Hraje si s počitadlo 4k - Stock záběry a video

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

Little boy and mother counts on abacus

Preschool student learning mathematics with abacus

Toddler is counting with wooden abacus. Baby is playing with old wooden device. Child is learning to count.

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

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

Mid section 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 African American schoolboy learning mathematics with abacus in a classroom. He is counting beads 4k

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

Front view of black boy playing with abacus at comfortable home. Black boy counting the blocks in abacus 4k