What is the longest sequence you can make from the numbers below?
1  2  3  4  5  6 
7  8  9  10  11  12 
13  14  15  16  17  18 
19  20  21  22  23  24 
Each number in the sequence must be a factor or multiple of the previous number.
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Topics: Starter  Arithmetic  Factors  Mental Methods  Number
Ten mins starter got year 6 thinking. Take away challenge to find longest sequence @Transum #WMSMaths pic.twitter.com/IiuL0ODV2O
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— MayV(@MayV1) May 8, 2019
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Numbers and the Making of UsI initially heard this book described on the Grammar Girl podcast and immediately went to find out more about it. I now have it on my Christmas present wish list and am looking forward to receiving a copy (hint!). "Caleb Everett provides a fascinating account of the development of human numeracy, from innate abilities to the complexities of agricultural and trading societies, all viewed against the general background of human cultural evolution. He successfully draws together insights from linguistics, cognitive psychology, anthropology, and archaeology in a way that is accessible to the general reader as well as to specialists." more... 
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What is the longest sequence that can be generated if the numbers 1 to 100 are available?
See Flabbergasted Game.
See the National Curriculum page for links to related online activities and resources.