Sometimes the Russian word каждый ‘every’ has an interesting interaction with the preposition по + dative singular. In effect, the по means ‘apiece’ or ‘each’. We call this the ‘distributive’ meaning of по:

Of course, in those contexts the каждый is redundant, so the sentence can be said the same way without it, in which case the people to whom things are given will most likely be expressed in the plural:

Oddly enough, if the number of things issued to the recipients is more than one, then the number phrase is accusative instead of dative: