matematicas

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Square root written on a blackboard Royalty Free Stock Photo

Ten percent written on a blackboard Royalty Free Stock Photo

Hundred percent written on a blackboard Royalty Free Stock Photo

Pythagorean theorem written with a chalk on the blackboard Royalty Free Stock Photo

Mathematical number pi, written with chalk on a blackboard Royalty Free Stock Photo

Plan A crossed out and Plan B written with a chalk on the blackboard Royalty Free Stock Photo

two plus two equals four, written on a blackboard Royalty Free Stock Photo

twenty percent written on a blackboard Royalty Free Stock Photo

Fifty percent written on a blackboard Royalty Free Stock Photo

Close up of a childÃÂ´s hand on the beads of a Japanese abacus (Soroban). An Abacus or counting frame is an instrument used for performing arithmetic processes.