Did you solve it? 2019 in numbers

Earlier today I set you the following puzzles about the number 2019 1) Date jam (i) Using only the digits 2, 0, 1 and 9, create expressions that equal all of the numbers from 0 to 12. The expressions can include any of the arithmetical symbols +, –, x, ÷ and √, and brackets. Here’s…

Can you solve it? 2019 in numbers

To welcome the New Year, we’re going to celebrate the number 2019. Here’s one numerical factoid readers may find charming: Ed Southall (@solvemymaths) 2019 is the smallest number that can be written in 6 ways as the sum of the squares of 3 primes: 7² + 11² + 43² = 2019 7² + 17² +…

Did you solve it? Can you speak Twitter?

Earlier today I set you a quiz about Twitter slang, and a maths puzzle. Here are the answers, with discussion and workings! The following ten words and phrases emerged in Twitter communities, and are beginning to cross over to general users. Under each word or phrase are two possible definitions. Which is the correct one?…

Lindsay Logan obituary

My father, Lindsay Logan, who has died aged 79, was emeritus professor of Dundee University and a distinguished educationist. He was head of the maths department at Northern College, Dundee, before it amalgamated with the university, where he became head of maths education. Through his passion for the teaching of mathematics, he made a significant…

Can social interactions affect spread of disease?

Most real-world systems, such as biological, social, and economic schemes evolve constantly. The dynamics of such systems are characterized by significantly enhanced activity levels over short periods of time (or “bursts”) followed by long periods of inactivity. This is true of social communities, in which the pattern of connections between individuals progresses over time, and…

Did you solve it? An Aboriginal family puzzle

Earlier today I set you the following puzzle: Aboriginal groups are divided into subgroups, called “skins.” Your skin is determined at birth, based on your parents’ skins, and it does not change in your lifetime. Your skin will determine certain social rules, such as who you are allowed to marry. The Warlpiri, who live northwest…

Can you solve it? An Aboriginal family puzzle

Hi guzzlers, Today I have a logic puzzle based on the complex kinship rules found in Australian Aboriginal society. Aboriginal groups are divided into subgroups, called “skins.” Your skin is determined at birth, based on your parents’ skins, and it does not change in your lifetime. Your skin will determine certain social rules, such as…