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In a childs younger years it has been determined that the child's weight is a linear function of the child's age. A baby weighs 9 pounds at birth and three years later weighs 30 pounds Express the childs, y as a function of age x

During high school, Erdős became an ardent solver of the problems proposed each month in KöMaL, the Mathematical and Physical Monthly for Secondary Schools. Erdős later published several articles in it about problems in elementary plane geometry

Another North African mathematician, al-Hassar, about the same time developed the modern way of writing fractions, with a bar separating the top from the bottom, like 1/2 or 2/7. Al-Hassar also wrote textbooks in Arabic about how to add whole numbers and fractions, how to calculate square roots and cube roots, and prime numbers

By 3000 BC, people in Egypt were using hieroglyphs to write down very large numbers.