Μεγάλη κορνίζα. Μαθηματική εργασία. Μαύρη σανίδα. Νεαρή έφηβη. Επιλύει το καθήκον του στο σχολικό συμβούλιο. Γράφω με κιμωλία στον πίνακα.. - Φωτογραφίες & Εικόνες Αρχείου

Long frame. Mathematical task. Blackboard. Young teenage girl. He solves the task standing at the school board. I write with chalk on the blackboard.

Mathematical task. Blackboard. Young teenage girl. He solves the task standing at the school board. I write with chalk on the blackboard.

Back view of schoolboy writing with chalk on blackboard

Teacher hand writing formulas on blackboard background

Close up of a hand writing on a blackboard

Schoolgirl thinks on the difficult task of mathematics on blackboard

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard. Oblong banner.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.

He writes on the chalkboard with chalk. Math problem. A girl at the chalkboard.