ҷуфт: even

Чор рақами ҷуфт аст.
Four is an even number.
Ададҳое, ки ба адади ду каратианд, ададҳои ҷуфт ном доранд.
Numbers which are multiples of the number two are called even numbers.

тоқ: odd

Ҷуфт is also used to mean a pair of something, like як ҷуфт мӯза – a pair of boots.

ҷуфт-ҷуфт: two by two, pair by pair