Writing a division algorithm proof

Chunking also known as the partial quotients method or the hangman method is a less-efficient form of long division which may be easier to understand.

Division Algorithm

Hence 4 is the quotient we subtracted 5 from 21 four times and 1 is the remainder. Then, we cannot subtract from it, since that would make the term even more negative. Proof[ edit ] The proof consists of two parts — first, the proof of the existence of q and r, and second, the proof of the uniqueness of q and r.

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Euclidean division

Subtracting 5 writing a division algorithm proof 21 repeatedly till we get a result between 0 and 5. We then give each person another slice, so we give out another 3 slices leaving. This will result in the quotient being negative.

This gives us At this point, we cannot subtract 5 again. This can be confirmed using multiplication, the inverse of division: In this case the remainder is zero, and it is said that 3 evenly divides 9, or that 3 divides 9. We have 7 slices of pizza to be distributed among 3 people.

Proof of the Division Algorithm

In fact, the long division algorithm requires this notation. Subtracting the two equations yields: Find the remainder when is divided by We now have to add 5 to repeatedly or, in other words, we have to subtract -5 repeatedly till we get a result between 0 and 5.

It is useful if Q is known to be small being an output-sensitive algorithmand can serve as an executable specification. If 9 slices were divided among 3 people instead of 4, each would receive 3 and no slices would be left over. Describe the distribution of 7 slices of pizza among 3 people using the concept of repeated subtraction.

Please help improve this section by adding citations to reliable sources. Intuitive example[ edit ] Suppose that a pie has 9 slices and they are to be divided evenly among 4 people. It shifts gradually from the left to the right end of the dividend, subtracting the largest possible multiple of the divisor at each stage; the multiples become the digits of the quotient, and the final difference is the remainder.

We say that What happens if is negative? In other words, each person receives 2 slices of pie, and there is 1 slice left over. We are now unable to give each person a slice. When used with a binary radix, it forms the basis for the integer division unsigned with remainder algorithm below.Stack Exchange network consists of Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange. I can do it by induction, thanks to the wonderful people of this website, but I'm not sure how to do it by the Division algorithm.

Can anyone help me? I think I can show how 3 divides 2n, but I'm not. A proof of the Division Algorithm is given at the end of the "Tips for Writing Proofs" section of the Course Guide. Now, suppose that you have a pair of integers a and b, and would like to find the corresponding q and r.

Proof of the Division Algorithm. A summer program and resource for middle school students showing high promise in mathematics. The Division Algorithm E.L. Lady (July 11, ) Theorem [Division Algorithm].

Division algorithm

Given any strictly positive integer d and any integer a,there exist unique integers q and r such that a = qd+r; and 0 rproof, I want to make some general remarks about what this theorem really.

The Division Algorithm is merely long division restated as an equation. For example, the division 32 29 Thus, in the algorithm given as the proof of Theorem 3 below, we may always assume that Algorithm 2: Writing gcd(a;b) = ma+nb.

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Writing a division algorithm proof
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