Old mechanical manual counting machine for arithmetical calculations.
Toy abacus ancient calculator math arithmetic
an orange calculator the numerical keys and basic arithmetic functions commonly calculations.
Financial paperwork. Unrecognizable person performs arithmetic operations calculates costs per month
Elementary student boy doing homework at home. Child learning to count, solves arithmetic examples
Close-up of water bottle, abacus and bunch of paper on the desk in school
Montessori material to present addition operations in schools.
Abacus
Burnt Calculator
Side view of a Caucasian schoolgirl learning mathematics with an abacus in the classroom at school
Child counting numbers on fingers
Cubes with the word MATHS and math symbols on blackboard on yellow background-education concept
Front view of cute African American boy learning mathematics with abacus in a comfortable home
Mathematical Symbols on Wooden Blocks: Addition, Subtraction, Multiplication, and Division
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
golden abacus and a hand
gold abacus closeup
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
Diversity in education with teacher studying math lesson on chalkboard in classroom
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.
