Fifty
numeral
What happens when you have ten five times? You get fifty!
ごじゅう
This is a jukugo word, which usually means on'yomi readings from the kanji. That's the case for this word too, which means you should already know how to read this word.
五十メートルしかウォーキングしなかった。
I only walked fifty meters.
ママは八日に五十になった。
Mom turned fifty on the 8th.
ポートランドの白人人口は五十パーセントよりも上なんです。
Portland's Caucasian population is higher than 50%.