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The Commonwealth of Australia Constitution Act (Imp. ) of 1900 established the House of Representatives as part of the new system of dominion government in newly federated Australia. The House is presided over by the Speaker. Members of the House are elected from single member electorates (geographic districts, commonly referred to as "seats" but officially known as "Divisions of the Australian House of Representatives"). One vote one value legislation requires all electorates to have approximately the same number of voters with a maximum 10% variation. However, the baseline quota for the number of voters in an electorate is determined by the number of voters in the state in which that electorate is found. Consequently, the electorates of the smallest states and territories have more variation in the number of voters in their electorates, with larger seats like Fenner containing more than double the electors of smaller seats like Lingiari. Meanwhile, all the states except Tasmania have electorates approximately within the same 10% tolerance, with most electorates holding 85,000 to 105,000 voters. Federal electorates have their boundaries redrawn or redistributed whenever a state or territory has its number of seats adjusted, if electorates are not generally matched by population size or if seven years have passed since the most recent redistribution. Voting is by the 'preferential system', also known as instant-runoff voting. A full allocation of preferences is required for a vote to be considered formal. This allows for a calculation of the two-party-preferred vote.