Let's start by measuring everything in the same units, rather than some in inches and some in feet.
(five feet + four inches) x (five feet)
= (sixty-four inches) x (sixty inches)
Now one inch is equal to 2.54 centimetres (this is one of those handy facts that's good to memorise), which means that
(sixty-four inches) = (sixty-four) * (2.54cm)
and
(sixty inches) = (sixty inches) * (2.54cm)
Further, a centimetre is 1/100 of a metre, so we write this as
(sixty-four inches) = (sixty-four) * (2.54cm) = (sixty-four) * (2.54) * (1/100 metre)
and
(sixty inches) = (sixty inches) * (2.54cm) = (sixty) * (2.54) * (1/100 metre)
So let's plug these two into our original equation, getting
(five feet + four inches) x (five feet)
= (sixty-four inches) x (sixty inches)
= (sixty-four) * (2.54) * (1/100 metre) * (sixty) * (2.54) * (1/100 metre).
All we have to do now is multiply, which gives us about 2.477 * (metre) * (metre) - a bit under two and a half square metres.
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54" x 150" inches is 8,100 square inches. This converts to 5.23 square meters.
If that is the size of a square room then it is 25 square meters
5 x 12 is not a square, but its area is 60 square meters.
5m x 5m = 25m2 (25 square metres)
1 foot = 0.3048 meter 5 meters x 3 meters = (5/0.3048) feet x (3/0.3048) feet = 15/(0.3048x0.3048) square feet