A simple majority of members is all that is required in either house to vote on an issue. It is always assumed that there is a quorum.
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A quorum in each house is set as a majority of it's members
The U.S. Constitution, Article I, Section 5, Clause 1 states in part, "... a Majority of each shall constitute a Quorum to do Business..." Currently (in May 2013) that is at least 218 Representatives and at least 51 Senators.
A quorum in each house is set as a majority of it's members
Each House shall be the judge of the elections, returns and qualifications of its own members, and a majority of each shall constitute a quorum to do business; but a smaller number may be adjourn from day to day, and may be authorized to compel the attendance of absent members, and under such penalties as each House may provide. Article I, Sec. 5, Clause 1
A quorum is the smallest number of members who must be present for business to be conducted. Each house can set its own rules about absent members. The minimum number of members of an assembly or society that must be present at any of its meetings to make the proceedings of that meeting valid.
According to the Constitution, a quorum is a majority of those holding office; thus for the Senate it is fifty-one Senators. Generally it is assumed there is a quorum present unless there is a quorum call, i.e. a request to establish that there really is a quorum.
At least six of the nine justices are required for form a quorum.
The number of representative in the U.S. House of Representatives is fixed at 435.
house members represent each country to give them a equal say in the matter at hand.
In the house of representatives there are 435 members. Unlike the senate that has 2 members for each state in the house some states may only have 1 representative while others have 18 or more. The amount each state has depends on its population, after each census the number of representatives for each state is adjusted.
Legislative