Early Quenya
nelde
cardinal. three; four
nelde tukse
cardinal. three hundred
ole
cardinal. three
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A number for “three hundred” from the Early Qenya Grammar (EQG) of the 1920s, a combination of ᴱQ. nelde “three” and the plural of ᴱQ. tuksa “hundred” (PE14/83).