Introduction: When saying numbers out loud, the order is slightly different in Dutch than in English. For a number like \$1234\$: in English you'd say: one thousand, two hundred and thirty-four in Dutch you'd say: duizend-tweehonderdenvierendertig, or more readable with spaces: duizend twee honderd en vier en dertig [literally translated to: thousand two hundred and four and thirty] Note two things in this example: How in English we have 'thirty-four', yet the order in Dutch is 'four and thir...| Recent Questions - Code Golf Stack Exchange
Given a positive integer as input, your task is to output a truthy value if the number is divisible by the double of the sum of its digits, and a falsy value otherwise (OEIS A134516). In other words: (sum_of_digits)*2 | number Instead of truthy / falsy values for the true and false cases, you may instead specify any finite set of values for the true/false case, and their complement the other values. For a simple example, you may use 0 for the true case and all other numbers for the false case...| Recent Questions - Code Golf Stack Exchange
Divide 1 by a sum/difference of square roots Input: An expression that is a sum/difference of square roots of positive integers. You can assme it will not equal 0. The general form is \$\pm\sqrt{a_1}\pm\sqrt{a_2}\pm\sqrt{a_3}\pm\cdots\pm\sqrt{a_n}\$ where each \$a_n\$ is a positive integer. There is no guarantee the input will be sorted or that the radicals are fully simiplfied. Duplicate \$a_k\$ are possible. Example: \$\sqrt2+\sqrt3+\sqrt7+\sqrt7-\sqrt9+\sqrt{12}\$ Output: the inverse of th...| Recent Questions - Code Golf Stack Exchange
Print integers 0 to 100 (inclusive) without using characters 123456789 in your code. Separator of numbers can be comma or white space (by default <blank>, <horizontal tabulator>, <newline>, <carriage return>, <form feed> or <vertical tabulator>). Shortest code wins.| Recent Questions - Code Golf Stack Exchange
Deleted questions on Stack Overflow sometimes make for great golf material. Write a function that takes a nonnegative integer as input, and returns true if all the digits in the base 10 representation of that number are unique. Example: 48778584 -> false 17308459 -> true Character count includes only the function. If you choose to answer in C or C++: no macros, no undefined behaviour; implementation-defined behaviour and compiler warnings are fine.| Recent Questions - Code Golf Stack Exchange
We are all familiar with the famous Fibonacci sequence, that starts with 0 and 1, and each element is the sum of the previous two. Here are the first few terms (OEIS A000045): 0, 1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144, 233, 377, 610, 987, 1597, 2584 --- Given a positive integer, return the closest number of the Fibonacci sequence, under these rules: The closest Fibonacci number is defined as the Fibonacci number with the smallest absolute difference with the given integer. For example, 34 ...| Recent Questions - Code Golf Stack Exchange
What would you say if I told you that in math everything is a set? That, whatever mathematical object you name, it can be defined using sets? And not sets, that contains some special ingredient somewhere deep inside - but by basically wrapping up empty sets and merging it with more wrapped empty sets in various degree of wrapping?| kubuszok.com
Thinking about how to teach counting? This counting books back to school printable is a great grab and go option for your start of the year math centers. Work on both learning numbers 1 to 20 and fine motor development with these counting clip cards!| Kool Kids Games
Fun hands-on math activities like these crayon fine motor number mats are an essential tool at the start of the year to teach your students the relationship between the number words and the values that they represent. You'll love teaching number sense with this printable crayon themed numbers activity!| Kool Kids Games
(this blog post was originally published in . It has been moved to this blog – with slight changes.) Remember Nietzsche’s famous announcement, “God is dead“? In the domain of mathematics, Ni…| Earth...Brains...Technology...Design
