The Smoker Difficulty Level: Ana Carolina is a big smoker, yet decided to quit. "I'll finish the twenty-seven cigarettes left over!" And said, "I'll never smoke again." It was Ana Carolina's habit to smoke exactly two thirds of each cigarette. It was not long before he discovered that with the help of an adhesive tape he could gather three stumps of cigarettes and make another cigarette.

Pi (worth about 3.14) is an irrational number, ie it has infinite decimal places. Since it does not form a periodic tithe, we cannot write it in the form of a fraction with integer and denominator integers. See the first few hundred decimal places of Pi: PI = 3.141592653589793238462643383279502884197169399375105820974944 592307816406286208998628034825342117067982148086513282306647 093844609550582231725359408128481117450284102701938521105559 644622948954930381964428810975665933446128475648233786783165 271201909145648566923460348610454326648213393607260249141273 724587006606315588174881520920962829254091715364367892590360 011330530548820466521384146951941511609433057270365759591953 092186117381932611793105118548074462379962749567351885752724 891227938183011949129833673362440656643086021394946395224737 190702179860943702770539217176293176752384674818467669405132 000568127145263560827785771342757789609173637178721468440901 224953430146549585371050792279689258923542019956112129021960 864034418159813629774771309960518707211349999998372978049951 059731732816096318595024459455346908302642522308253344685035 261931188171010003137838752886587533208381420617177669147303 59825349042875546873115956 2863882353787593751957781857780532 171226806613001927876611195909216420198938095257201065485863 278865936153381827968230301952035301852968995773622599413891 249721775283479131515574857242454150695950829533116861727855 889075098381754637464939319255060400927701671139009848824012 858361603563707660104710181942955596198946767837449448255379 774726847104047534646208046684259069491293313677028989152104 752162056966024058038150193511253382430035587640247496473263 914199272604269922796782354781636009341721641219924586315030 286182974555706749838505494588586926995690927210797509302955 321165344987202755960236480665499119881834797753566369807426 542527862551818417574672890977772793800081647060016145249192 173217214772350141441973568548161361157352552133475741849468 ... pi consists in a numerical proportion which originates from the relationship between the perimeter of a circle to its diameter.

Filter by difficulty level Very easy (8) Easy (49) Medium (96) Difficult (31) Very difficult (9) Displaying 9 level challenges Very hard: [Remove Filter] Challenge 12 Escalator Challenge 101 The Damn Tomatoes Challenge 106 Radigunda Needs Money Challenge 110 Traveler's Gold Challenge 168 Spinning the Coin Challenge 169 Playing Dice Challenge 170 The Square Starting at 999 Challenge 189 Fourth Power Plus Four Challenge 191 The Boy, Tennis and the Whistles Do you know any mathematical challenges that could be published here?

How to cross the river? The 60 and 65kg men cross. One of them comes back. What weighs 80kg goes through alone. The boat returns with what was left. Finally the 60 and 65kg cross, and the three will be across the river. Back to statement Challenge 32 What is the next issue? Challenge Index Next >> Challenge 34 How Many Nines?

The rabbit and its food The poor rabbit will never reach its food, for the remaining distance will always be divided by two, never reaching zero. Back to statement Challenge 130 The Traveler Challenge Index Next >> Challenge 132 Adults and Children in the Elevator

It comes from the Latin adjective abscíssus, which means "separated in two, interrupted, separated". In 1919, Swiss mathematician Florian Cajori stated that the words "abscissa" and "ordinate" were not used by Descartes. It is also known that although the word "abscissa" has been used at least since De Practica Geometrie, published in 1220 by Fibonacci (Leonardo de Pisa), its use in the most modern sense is due to other mathematicians several centuries after. .