The phrase "a common number" is correct and usable in written English.
It can be used when referring to a number that is frequently encountered or widely recognized in a particular context.
Example: "In statistics, the number 100 is often considered a common number for sample sizes."
Alternatives: "a typical number" or "a familiar number".
Eight chukkers are played in Argentina, and four is a common number in England and on the European continent.
(Current students living in Single Graduate Student Housing who renewed their housing contracts were not given application numbers). Students who requested to be in a group were given a common number.
So that all of your jigsaw pieces all end up the same size, you want the length and the width of the photograph and card to be divisible by a common number (eg. 12cm by 24cm would give you 32 3x3cm pieces).
Customers can do basic banking transactions such as balance inquiry, funds transfer, merchant payments, cheque book request, statement request, etc. through a common number and a simple menu-driven mode irrespective of where the telecom account is and where the bank account is.
Cattle targeted for niche markets requiring abandonment of antimicrobials and or) growth promotants may have similar or lower production costs when fed for a common number of days, but must garner premiums above those associated with improved carcass quality to be economically competitive with conventionally finished steers.
The intersection in unique because some states, such as California, do no allow two highways to share a common number.
The most seamless transfers are in states like Florida, where public institutions have adopted a common numbering system.
The new lines allowed the two companies to operate on each other's lines, and they introduced a common numbering scheme for the services.
A further tool is a small handbook of questions in various languages with a common numbering system so that the appropriate numbered question can be asked and shown to the fishing vessel master in his/her language.
A less common number was seven, representing the cardinal direction plus "up" or the sky, "down" or the world below, and "centre" or the location of the ritual.
As a result, the common number of pollen was reduced in anthers of mutant plants.
