generate questions: Mathematics: The earliest traces of mathematical knowledge in the Indian subcontinent appear with the Indus Valley Civilization (c. 4th millennium BC ~ c. 3rd millennium BC). The people of this civilization made bricks whose dimensions were in the proportion 4:2:1, considered favorable for the stability of a brick structure. They also tried to standardize measurement of length to a high degree of accuracy. They designed a ruler—the Mohenjo-daro ruler—whose unit of length (approximately 1.32 inches or 3.4 centimetres) was divided into ten equal parts. Bricks manufactured in ancient Mohenjo-daro often had dimensions that were integral multiples of this unit of length.
The Indus Valley Civilization was the first to have traces of what? {sep_token} What proportional size were the bricks that the civilization used? {sep_token} What characteristic determined the proportions of the bricks? {sep_token} What was the name of the ruler that they created? {sep_token} How long were the units in inches of the Mohenjo-daro ruler? {sep_token}