Phil,
Yes, you require a math co-processor abilities in any machine running 3D
Studio.
If the machines you are referring to are 486 "DX" systems, the math
co-processor is already there. If the machines are 486 "SX" they will
require a co-processor to be installed. If the machines are 386
systems, math co-processors will need to be installed.
Hope this helps,
-Jeff