Science · Facts & stats · iChallenge network
Daily facts and stats about powers of ten, plus real challenges to put them to work.
What is 10 to the power of 0?
Any nonzero number raised to the power of 0 equals 1.
One ranked attempt per day. Practice as much as you like.
Join one, log your days or post your proof. Finishing earns XP and the Finisher badge.
Each day, estimate something big or small to the nearest power of ten, like grains of rice in a bag, then check. Check in daily.
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Make a chart from a millimeter to a kilometer, with one real object for each power of ten. Post a photo link or write-up.
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Make flashcards for the metric prefixes from nano to giga and quiz a friend. Post a short write-up of how they did.
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Live counts from 10xChallenge.com. All arena stats →
Earned on any arena, shown on your profile everywhere.
Add your email to keep your level, streak and badges if you switch devices, and carry them to every iChallenge arena. One email when you save; no spam.
Fund a prize on 10xChallenge.com and your brand sits on the challenge card, the leaderboard and every finisher's share. Prizes only appear once they're funded, so players can trust what they see.
No — knowledge games only. Nothing here is financial advice.
Only when a sponsor funds a prize. Funded prizes and their rules are shown on the challenge card; otherwise you play for rank and badges.
Everyone on this arena gets the same five questions each day, from easy to hard. You get one ranked attempt; practice rounds are unlimited.
100 points per correct answer, up to 50 more for answering quickly, a combo multiplier for answers in a row, and 150 bonus points for a perfect round.
Yes. Playing, streaks, badges and leaderboards are free. Some challenges carry a sponsor-funded prize; the challenge card shows it when one is funded.