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Which quantity is larger? Compare everyday measurements.
Crazy Comparisons is a free estimation quiz that makes numbers tangible. A slot machine spins to reveal a fun question - like "How many rubber ducks fill an Olympic swimming pool?" - and you choose the closest answer from four options.
How it works. Press "Spin!" and watch four slots blur with random words. They lock one by one, building suspense, until a complete question appears. Pick your answer, see if you're right, and read the math behind it.
What you learn. Every question is a mini Fermi estimation problem - the kind of back-of-the-envelope reasoning used by scientists and engineers. Players develop number sense, scale awareness, and the ability to make educated guesses about quantities they've never measured.
For all ages. Kids aged 6-12 love the slot machine animation and the surprising answers ("40 million popcorn kernels weigh as much as an elephant!"). Older players enjoy the mental math challenge. Every explanation shows the real calculation so you can verify the answer yourself.
25 languages. Play in English, Spanish, French, German, Chinese, Japanese, Korean, Arabic, Hindi, Swedish, Portuguese, Russian, and 13 more languages. Questions and explanations are fully translated - not just the buttons.
Part of the PlayMemorize family of free memory and learning games.
Q: What is Crazy Comparisons?
Crazy Comparisons is a free size-estimation quiz game. A slot machine spins to reveal fun questions like 'How many hotdogs laid end-to-end cross a football field?' and you pick the closest answer from four choices.
Q: What age group is Crazy Comparisons for?
The game is designed for ages 6 and up. Younger children enjoy the slot machine animation and surprising answers, while older players develop estimation and number-sense skills.
Q: How does the slot machine work?
Each question has four slots that spin with random words. They lock one by one to reveal a coherent comparison question. The spinning is purely visual - each question is carefully fact-checked.
Q: What skills does this game teach?
Crazy Comparisons builds estimation skills, number sense, and an intuition for scale - sometimes called Fermi estimation. Players learn to reason about large numbers by connecting them to familiar objects.
Q: Can I play in my language?
Yes! Crazy Comparisons is available in 25 languages including English, Spanish, French, German, Chinese, Japanese, Korean, Arabic, Hindi, and many more.
Q: How are the answers calculated?
Every answer is based on real measurements. For example, we use the actual weight of a popcorn kernel (0.15 g) and an elephant (6,000 kg) to calculate that 40 million pieces of popcorn weigh as much as one elephant.
