Barry and Chris (not Alex and Chris)
Thanks for the catch. I've updated the explanation.
Rounding off numbers to n decimals
Sum of the Matrix Elements
Matlab Basics - Absolute Value
Word Distance - Sum
Word Distance - Average Sort
Combined Ages 4 - Non-symmetric with multiples, n ≥ 3
Lights Out 7 - 5x5, x moves
Divisible by n, Truncated-number Divisors
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