Fraction
Fractions with the same denominator can be added by adding the numerators. This topic is part of Mathematics within Science & Nature. This page currently draws on 26 supporting questions, with answers and bonus facts available below.
Fraction trivia questions
In the fraction 3/4, what is the top number called?
Answer: Numerator
Bonus fact: The numerator shows how many parts are being considered.
What is 2/3 plus 1/3?
Answer: 1
Bonus fact: Fractions with the same denominator can be added by adding the numerators.
What is the reciprocal of 7/9?
Answer: 9/7
Bonus fact: The reciprocal of a nonzero fraction is found by interchanging numerator and denominator.
A simple half-wave dipole antenna has a total length approximately equal to what fraction of the signal wavelength?
Answer: One-half
Bonus fact: A half-wave dipole is approximately half a wavelength from end to end.
What type of asteroid is especially rich in carbon and makes up a large fraction of known asteroids?
Answer: C-type
Bonus fact: C-type asteroids are dark, carbon-rich objects and are among the most common asteroid classes.
What is 0.25 written as a common fraction in simplest form?
Answer: 1/4
Bonus fact: Twenty-five hundredths simplifies to one quarter.
On the Moon, a person's weight is about what fraction of their weight on Earth?
Answer: One-sixth
Bonus fact: The Moon's surface gravity is about 16.5% of Earth's.
Roughly what fraction of a typical iceberg's volume is below the waterline?
Answer: About 90%
Bonus fact: Because ice is only slightly less dense than seawater, most of an iceberg is submerged.
What process separates crude oil into fractions by boiling point?
Answer: Fractional distillation
Bonus fact: A distillation column separates hydrocarbons.
Lake Baikal contains roughly what fraction of the world's unfrozen surface freshwater?
Answer: About one-fifth
Bonus fact: Its enormous volume makes it the largest freshwater lake by volume.
Moon gravity is about what fraction of Earth's surface gravity?
Answer: One-sixth
Bonus fact: Astronauts weigh much less on the Moon.
After two half-lives, what fraction of the original radioactive material remains?
Answer: One-quarter
Bonus fact: Half of half is one-quarter.