'yield a number' is a correct and usable sentence in written English.
You can use this phrase when you are wanting to describe a situation which produces a numerical result. For example: The survey yielded a number of interesting responses.
They also yield a number of important by-products.
Their experiments yield a number of successful recipes, which Gold helpfully includes, for Crock Pot Rabbit, Jamballama, Buffaloaf and other exotic variations on familiar favorites.
Measuring the relationship between the height from which a ball is dropped and its speed when it hits the ground, for instance, will yield a number very close to one, showing a nearly perfect correlation.
Both Jews and Christians have used various exegetical methods throughout their history, and doctrinal and polemical intentions have often influenced interpretive results; a given text may yield a number of very different interpretations according to the exegetical presuppositions and techniques applied to it.
These findings yield a number of implications for practice and policy.
The homogeneity properties of the corresponding controllers yield a number of practically important features.
A polystyrene (PS /polyethylene (PE) wax blend was studied because, based on a classic analysis by G.I. Taylor, melt mixing was expected to yield a number-average dispersed-phase domain size, Dn, well above 1 μm.
Herschel's mission yielded a number of significant findings.
And, rather positively, that short spell from England in the field yielded a number of positives.
Sam Buntrock's production makes nifty use of a traverse stage and yields a number of good performances.
A recent search on the site yielded a number of amusing options in the $15 to $40 range.
