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Excel in math and science
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It's hard to learn from lectures and videos
Learn more effectively through short, conceptual quizzes.
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Cryptograms
Cryptograms are puzzles where some (or all) digits are missing from an arithmetic operation. Tinker with different combinations of numbers and letters to unlock the right answer.
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
\[ \begin{array}{ccccc} & & & & 1&3 \\ + & & & & \bigtriangledown &7\\ \hline & & & 1 & 0 &0 \end{array} \]
Find the value of \(\bigtriangledown\) satisfying the cryptogram above.
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.
\[ \begin{array}{ccccc} & & & & \spadesuit&2 \\ & & & & \spadesuit&\spadesuit\\ + & & & & 1 &\spadesuit\\ \hline & & & & 7 &8 \end{array} \]
Find the value that represents the symbol \( \spadesuit\).
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.
\[ \begin{array}{ccccc} & & & & 9 &P \\ - & & & & P & Q \\ \hline & & & & Q & 6 \end{array} \]
Find the value of 2-digit integer \( \overline{PQ} \).
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.
\[ \begin{array}{ccccc} & & & & \color{red} A & B \\ + & & & & \color{red} C & D \\ \hline & & & & \color{red} E & F \end{array} \]
The cryptogram above shows the sum of two 2-digit integers producing another 2-digit integer. In the leftmost column highlighted in red, which of the following cannot be true?
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.
\[ \begin{array}{ccccc} & & & & 9 &5 \\ - & & & & 1 &\blacktriangle \\ \hline & & & & \blacktriangle & 8 \end{array} \]
Find the value that represents the symbol \(\blacktriangle\).