Old mechanical manual counting machine for arithmetical calculations.
Financial paperwork. Unrecognizable person performs arithmetic operations calculates costs per month
Close-up of water bottle, abacus and bunch of paper on the desk in school
Montessori material to present addition operations in schools.
Side view of a Caucasian schoolgirl learning mathematics with an abacus in the classroom at school
Child counting numbers on fingers
Front view of cute African American boy learning mathematics with abacus in a comfortable home
Detail of the colored beads of a wooden abacus, elementary educational material.
Bars for counting and doing arithmetic operations on a montessori material.
Boy learning mathematics with abacus at desk in classroom at elementary school
Cute schoolboy learning math with abacus at desk
Boy learning math with abacus in a classroom at elementary school
Schoolboy learning math with abacus at desk in classroom at elementary school
Beads to learn to count in a montessori classroom on aged wood.
Thoughtful mixed-race schoolboy learning mathematics with abacus in a classroom at elementary school
Beads to learn to count in a montessori classroom on aged wood.
Beads to learn to count in a montessori classroom on aged wood.
Focused mixed-race schoolboy learning mathematics with abacus in a classroom
Boxes with beads to learn to count in a montessori classroom on aged wood.
Boxes with beads to learn to count in a montessori classroom on aged wood.
Boy learning mathematics with abacus at desk in classroom at elementary school
Schoolgirl learning mathematics with abacus in classroom at school
Boxes with beads to learn to count in a montessori classroom on aged wood.
Boxes with beads to learn to count in a montessori classroom on aged wood.
Boxes with beads to learn to count in a montessori classroom on aged wood.
Cute mixed-race schoolgirl learning mathematics with abacus in the classroom
Schoolboy learning mathematics with abacus in a classroom at elementary school
Cute schoolgirl learning mathematics with abacus in the classroom at school
Boxes with beads to learn to count in a montessori classroom on aged wood.
Boxes with beads to learn to count in a montessori classroom on aged wood.
