Mathematics questions This is a list of recently added questions about mathematics. Play mathematics quiz and see all the questions. Which numeral system was in use in ancient Sumer and Babilon?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. Created by: smyruvery hard 32% octaloctal1983binarybinary1798decimaldecimal2367sexagesimalsexagesimal2921numbers 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.Created by: Paweł Kołodziejczykvery hard 25% the OH − ion concentration is smaller than the H+ ion concentrationthe OH − ion concentration is smaller than the H+ ion concentration520the OH − ion concentration is greater than the H+ ion concentrationthe OH − ion concentration is greater than the H+ ion concentration396the OH − ion concentration is equal of the H+ ion concentrationthe OH − ion concentration is equal of the H+ ion concentration567Such solution doesn't existSuch solution doesn't exist558chemistry riddles » How many degrees an obtuse angle can have ?90-180. The obtuse angle may measure from 90 to 180 degrees. Angles having a degree of 0 to 90 are acute angles, whereas those from 180 to 360 - concave angles.Created by: TotalBellendeasy 77% 0-3600-36027490-18090-18052760-900-90175180-360180-3601122geometry riddles » What is the volume of a soap bubble with radius R=1 cm?4/3π cm3. Equation for the volume of a sphere: 4/3πR^3.Created by: Paweł Kołodziejczykhard 57% 3/4π cm33/4π cm315324/3π cm34/3π cm344264,3π cm34,3π cm3801It isn't possible to calculateIt isn't possible to calculate901numbers riddles » What is the result of 2+2*2?6. The multiplication has a priority over addition, and so the result is 2+(2*2) = 2+4 = 6.Created by: Paweł Kołodziejczykvery easy 83% 4412288967666302Not enough dataNot enough data186numbers riddles » Which of the following numbers is the greatest?1/3. Quite surprisingly, most players answer that both answers 1/3 and 33% are correct. But 1/3 is more than 33%. (it is 33.3333333...)Created by: globalquiz.orghard 52% 1/31/356320,30,346633%33%1053Both answers 1/3 and 33% are correctBoth answers 1/3 and 33% are correct3477numbers riddles » Which famous scientist was born on the Pi day? (March 14)Albert Einstein. 14 of March is celebrated on many schools and universities as both Pi Day and the birthday of Albert Einstein. On of the traditions is the 'Pi Pie' (pictured).Created by: globalquiz.orghard 48% Albert EinsteinAlbert Einstein4214Blaise PascalBlaise Pascal1519Isaac NewtonIsaac Newton1510all of the aboveall of the above1505scientists riddles » Which of the following is a prime number?16769023. A prime number has no positive divisors other than 1 and itself. Hence, a prime bigger than 2 cannot be even. All prime numbers bigger than 5, written in the usual decimal system, end in 1, 3, 7, or 9. Created by: Sumit Tamangaverage 66% 2388299023882990102016769023167690237495383772963837729696211723835117238351780math riddles » How many possible code combinations are there for this kind of lock?10000. The possible codes are from 0000 to 9999 inclusive. There are 10 possibilities for each ring, thus there are 10*10*10*10 possible codes.Created by: Teddyhard 51% 9999994701000100062699999999339810000100004771bicycles riddles » If Earth's radius was larger by 1 meter, how much longer would its equator be?By approx 6 meters. For each circle, the length of the circumference is c=2πr. Hence, if a radius grows by 1 meter, the circumference grows by 2 π meters - no matter what the initial value of radius was.Created by: SpikeMehard 44% by approx 6 metersby approx 6 meters6638by approx 6 kilometersby approx 6 kilometers2560by approx 60 kilometersby approx 60 kilometers3131by approx 6000 kilometersby approx 6000 kilometers2513Earth riddles » Play mathematics quiz and see all the questions.