I understand that a minimum for numerical precision may be set a minimal required precision . Is there anyway to also set a maximum numerical precision?

I require to write some questions regarding appropriate precision in arithmetical computations where, an answer is to be expressed to the same precision (d.p) as the term with the least amount of d.p in sums and differences. Similarly an answer is to be expressed to the same precision (s.f) as the the factor with the least amount of s.f in products and ratios.

Zak