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Pronunciation/

Meaning
いち (ichi) = 1
に (ni) = 2
さん (san) = 3
し (shi)　よん (yon) = 4
ご(go) = 5
ろく(roku)
しち (shichi)　なな (nana) = 7
はち (hachi) = 8
きゅう (que) = 9
じゅう (gyu) = 10

Two different ways to pronounce
漢音

(かんおん/kan on)
and
和音(わおん/wa on)

Some Kanji (Chinese) characters used in Japanese can have at least two different pronunciation. Commonly, one pronunciation sounds similar to the original Chinese and this is called

漢音(かんおん/kan on). The other pronunciation is completely original Japanese and this is called 和音(わおん/wa on).