Ask unlimited questions for free
People about to have surgery must tell their health care providers about all supplements they take.
The horizontal fraction bar was introduced by the Arabs.
The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.
The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."
For a complete list of videos, visit our video library