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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, interactive explorations.

Used and loved by over 6 million people

Learn from a vibrant community of students and enthusiasts,
including olympiad champions, researchers, and professionals.

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Basic Mathematics

Decimals

Concept Quizzes

Addition
Multiplication
Word Problems
Converting Decimals into Fractions
Place Value
Scientific Notation

Challenge Quizzes

Level 1
Level 2
Level 4

Adding Decimals

What is the value of \( 0. 2 + 0.1 \)?

\( 1 \) \( 0.3 \) \( 0.2 \) \( 0.1 \)

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by Brilliant Staff

What is the value of \( 0. 8 + 0.7 \)?

\( 1.5 \) \( 0.7 \) \( 2 \) \( 0.8 \)

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by Brilliant Staff

What is the value of \( 2. 3 + 0. 16 \)?

\( 2.16 \) \( 2.46 \) \( 3.9 \) \( 0.39 \)

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by Brilliant Staff

Evaluate \[6.3-(-4.4)-(-17.3).\]

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by Brilliant Staff

What is the value of \( 5. 6 + 4.9 \)?

\( 9 \) \( 10.5 \) \( 10 \) \( 9.5 \)

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by Brilliant Staff

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