Count in fractions

Using 2D shapes follow the criteria to build a new 2D shape e.g can you use 4 squares to make{...}

http://https://nrich.maths.org/1783 I’m thinking of a number. My number is both a multiple of 5 and a multiple of 6. What could my number{...}

http://https://nrich.maths.org/5576 Four numbers in little boxes are put into a special big box that does a multiplication, then four new{...}