When the vote was held to see if equal right could be given to indigenous people, 90% voted yes. If 630,000 people voted, how many voted yes

90% means 90 out of every 100, so: 90% of 630,000 is

$${\frac{{\mathtt{90}}}{{\mathtt{100}}}}{\mathtt{\,\times\,}}{\mathtt{630\,000}} = {\mathtt{567\,000}}$$