10 most difficult mathematics riddles A list of ten (out of 58) mathematics related questions that are the most often answered incorrectly Mathematics quiz How is the infinity symbol called?Lemniscate refers not only to the infinity symbol but also to any geometric shape that is curved like a figure-eight.very hard 17% lemniscatelemniscate17%omniscateomniscate61%perniscateperniscate11%ettoniscateettoniscate8%Created by: Ninjai. Statistics based on 474 answers in 3 languages »geometry riddles » Which mathematician is it?Henri Poincaré. Jules Henri Poincaré was a French mathematician, theoretical physicist, engineer, and philosopher of science. He is often described as a polymath, and in mathematics as " The Last Universalist"n since he excelled in all fields of the discipline as it existed during his lifetime. He was responsible for formulating the Poincaré conjecture, which was one of the most famous unsolved problems in mathematics until it was solved in 2002–2003 by Grigori Perelman. In his research on the three-body problem.very hard 23% Grigory PerelmanGrigory Perelman8%Gottfried Wilhelm LeibnizGottfried Wilhelm Leibniz34%Henri PoincaréHenri Poincaré23%Stefan BanachStefan Banach33%Created by: Tschuka . Statistics based on 494 answers in 2 languages »scientists riddles » The illustration shows the figure known in mathematics as;Lune of Hippocrates,. In geometry, the lune of Hippocrates, named after Hippocrates of Chios, is a lune bounded by arcs of two circles, the smaller of which has as its diameter a chord spanning a right angle on the larger circle. Equivalently, it is a non-convex plane region bounded by one 180-degree circular arc and one 90-degree circular arc. It is the first curved figure to have its exact area calculated mathematically.very hard 24% Tales' sailsTales' sails25%Pythagorean sicklesPythagorean sickles23%Archimedes' archesArchimedes' arches25%lune of Hippocrates,lune of Hippocrates,24%Created by: Tschuka . Statistics based on 243 answers in 2 languages »geometry riddles » Which of the following is true for the solution with the pH=0?The OH − ion concentration is smaller than the H+ ion concentration. In chemistry, pH is a numeric scale used to specify the acidity or alkalinity of an aqueous solution. It is the negative of the logarithm to base 10 of the activity of the hydrogen ion .Traditionally the pH is being defined as: pH = - log10 [H+], where [H+] it is a H+ ions concentration in mol/dm^3 (M). So if pH = 0 this H+ ions concentration is 1 mol/dm^3 and the solution is strongly acidic.very hard 25% the OH − ion concentration is smaller than the H+ ion concentrationthe OH − ion concentration is smaller than the H+ ion concentration25%the OH − ion concentration is greater than the H+ ion concentrationthe OH − ion concentration is greater than the H+ ion concentration19%the OH − ion concentration is equal of the H+ ion concentrationthe OH − ion concentration is equal of the H+ ion concentration28%Such solution doesn't existSuch solution doesn't exist26%Created by: Paweł Kołodziejczyk. Statistics based on 3381 answers in 2 languages »numbers riddles » Which of the following Roman numerals stands for 4?Both IV and IIII. Both notations are correct and historically Roman numerals were often written less consistently than today. The notation 'IIII' is often seen on clock faces. The reason for that may be practical, to avoid confusing the IV and VI when the clock is held upside down (although other theories also exist).very hard 26% IVIV71%IIIIIIII1%Both IV and IIIIBoth IV and IIII26%None of the aboveNone of the above1%Created by: globalquiz.org. Statistics based on 6362 answers in 4 languages »ancient Rome riddles » A given natural number is divisible by 4 if and only if ...?The number created from the last two digits is divisible by 4. The last two digits form a number that is divisible by 4; 40,832: 32 is divisible by 4. If the tens digit is even, the ones digit must be 0, 4, or 8. If the tens digit is odd, the ones digit must be 2 or 6. 40,832: 3 is odd, and the last digit is 2. Twice the tens digit, plus the ones digit is divisible by 4. very hard 27% the last digit is divisible by 4the last digit is divisible by 415%the last two digits are divisible by 4the last two digits are divisible by 432%the sum of the last two digits is divisible by 4the sum of the last two digits is divisible by 423%the number created from the last two digits is divisible by 4the number created from the last two digits is divisible by 427%Created by: Tschuka . Statistics based on 651 answers in 2 languages »numbers riddles » Which mathematician laid the foundations for abstract algebra (especially the group theory)?Évariste Galois was a French mathematician born in Bourg-la-Reine. While still in his teens, he was able to determine a necessary and sufficient condition for a polynomial to be solvable by radicals, thereby solving a problem standing for 350 years. His work laid the foundations for Galois theory and group theory, two major branches of abstract algebra, and the subfield of Galois connections. He died at age 20 from wounds suffered in a duel.very hard 30% Évariste GaloisÉvariste Galois30%Stefan BanachStefan Banach31%David HilbertDavid Hilbert22%Bertrand RussellBertrand Russell16%Created by: Ninjai. Statistics based on 1382 answers in 3 languages »science riddles » What is the largest integer ever used in a mathematical proof?Graham's number is an enormous number that arises as an upper bound on the answer of a problem in the mathematical field of Ramsey theory. The number was published in the 1980 Guinness Book of World Records, adding to its popular interest.very hard 31% GoogolplexGoogolplex13%GoogolGoogol38%Graham's numberGraham's number31%CentillionCentillion17%Created by: Ninjai. Statistics based on 3756 answers in 2 languages »numbers riddles » Which numeral system was in use in ancient Sumer and Babylon?Sexagesimal. Remnants of highly composite sexagesimal system are in use even today for measuring angles, geographic coordinates and especially time. An hour of time is divided into 60 minutes, which in turn are divided into 60 seconds.very hard 32% octaloctal22%binarybinary20%decimaldecimal24%sexagesimalsexagesimal32%Created by: smyru. Statistics based on 13709 answers in 2 languages »ancient history riddles » What is the base value of the natural logarithm?Napier's constant. The natural logarithm of a number is its logarithm to the base of the mathematical constant e (Euler's number), occasionally referred to as Napier's constant. The common logarithm is the logarithm with base 10, while the binary logarithm is the logarithm with base 2.very hard 32% Napier's constantNapier's constant32%101030%number πnumber π20%2216%Created by: Ninjai. Statistics based on 739 answers in 2 languages »science riddles » Play mathematics quiz and see all the questions.