This is the 1423rd most frequent Russian word.
двум
The word "двум" means "to two" or "for two" in English, functioning as the dative case of "два" (two).
The word 'двум' here is the dative case of the numeral 'два', used to indicate the indirect object of the verb 'помог'.
Я помог двум друзьям переехать.
I helped two friends move.
'Двум' is used in the dative case to indicate the recipients of the gifts.
Мы подарили двум детям подарки.
We gave gifts to two children.
Here, 'двум' is in the dative case to signify to whom the explanation was directed.