It is not possible to answer the question.
There are infinitely many ways to express 740 as a sum of 2 numbers, an infinite number of ways to express it as a sum of 3 numbers, 4 numbers, ... , infinitely many numbers.
And the same can be said for multiples of 2, 3, ... numbers.
But you cannot write an infinite number of expressions.
Perhaps you can start with
370+370, 371+369, 372+368, ... 740+0, 741-1, 742-2 and see how far you get in an hour. Then make a guess at your life expectancy and how many hours per day you are prepared to dedicate to this task. That will give you a maximum number of ways. It will be a maximum because you will slow down as the numbers get bigger and you have to write integers with tens of digits (I doubt that you will get that far).
740 written in exponential form is 7.4 x 10^2
As many as you want.
Six ways.
Divide 740 by 60 to get 12.333 hours.
7.4 meters equals 740 cm.
740 written in exponential form is 7.4 x 10^2
74 x 10 = 740
you can write that answer a thousand million ways!
We suppose you can write it as many ways as you want, but only one of them will be spelled correctly.
740 yards = 0.4205 mile or Zero miles and 740 yards.
740 feet = 0.1402 miles
740 inches = 20.55 yards
740 meters=0.74 kilometers
740 mg = 0.74 g
As many as you want.
As many as you want.
Six ways.