17 experiments

• Arabic and Roman numerals

• Place value and step numbers

• Addition of natural numbers

• Written addition

• Adding Roman numerals

• Subtraction of natural numbers

• Written subtraction

• Origin of negative numbers

• The set of whole numbers

• Addition of whole numbers

• Commutative law of addition

• Subtraction of whole numbers

• Multiplication of whole numbers

• Written multiplication

• Distributive law of multiplication

• The square numbers from 1 to 625

• Division by whole numbers

• Written division