It is not possible to give a sensible answer to the question since you have not stated the inits for 342 and 156. There number of square feet in 342 inches x 156 inches will be quite different from that in 342 miles x 156 miles!
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You would simply multiply the two numbers to get the area. This would give you 53,352 square feet.
The GCF of 342 and 380 is 38.
The Greatest Common Divisor of 342, 855 is 171.
342% = 3.42 which is a fraction in decimal form rather than in the form of a ratio. However, that does not stop it being a fraction. Its equivalent, in rational form, is 342/100. You can simplify that if you so wish.
It is 3.42
3.42 written as a fraction is 342/100, or 171/50 in simplest form.