Waste less time on Facebook — follow Brilliant.
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Decimals
Coins are often used to express a fraction of a currency. In the US, a quarter is $0.25 and a dime is $0.10. Counting change is just one of many ways you can put decimals to use in everyday life.
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
Concept Quizzes
Jenny currently has \(15.20\) dollars. She buys \(3\) chocolate bars that cost \(25\) cents each, and \(5\) notebooks that cost 50 cents each. How much does she have left?
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
A candle has length \(24\) cm. Once lit, the candle burns away at a constant rate of \(0.2\) cm per minute. What is the length of the candle (in cm) \(10\) minutes after it is lit?
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
James bought \( 5 \text{ kg} \) of candy for \( $ 8.00. \) If Susan wants to buy \( 1.3 \text{ kg} \) of candy and pays an extra \( $ 0.01 \) for the paper bag, how much should she pay?
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
The price for sending a package at the post office varies by the weight of the package according to the following table:
\[\begin{align} \text{Weight of Package (kg)} &&\text{Price (dollars)}\\ \text{Under 1 kg} &&\text{1}\\ \text{1 kg or more and under 3 kg} &&\text{1.5}\\ \text{3 kg or more and under 5 kg} &&\text{2}\\ \text{5 kg or more and under 10 kg} &&\text{2.5}\\ \text{10 kg or more} &&\text{3} \end{align}\]
If Leonard sends a package which consists of one \(0.5\text{ kg}\) pen, three \(0.1\text{ kg}\) postcards, and two \(0.8\text{ kg}\) booklets, how much will he have to pay at the post office?
Excel in math and science
Master concepts by solving fun, challenging problems.
It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
Our wiki is made for math and science
Master advanced concepts through explanations,
examples, and problems from the community.
Used and loved by 4 million people
Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.
What is the perimeter of a rectangle whose width is \(3.3\) and length is \(6.3?\)