Group of elementary school children in classroom at lesson

elementary student education classroom school children elementary school elementary age teacher student learning group chalk - art equipment child 4-5 years teenage boys boys university 6-7 years test results board eraser 8-9 years ukraine writing preparation mathematics human hand small 4k people childhood friendship young adult hand indoors human back children only blackboard - visual aid girls teenager plank - timber back caucasian picking up green success togetherness mathematical symbol close-up schoolgirl happiness lifestyles chalk drawing looking up body part human eye waist up