{"id":86,"date":"2023-05-04T10:00:45","date_gmt":"2023-05-04T04:30:45","guid":{"rendered":"https:\/\/www.aplustopper.com\/?p=86"},"modified":"2023-05-05T09:16:24","modified_gmt":"2023-05-05T03:46:24","slug":"euclid-division-algorithm","status":"publish","type":"post","link":"https:\/\/www.aplustopper.com\/euclid-division-algorithm\/","title":{"rendered":"What is Euclid Division Algorithm"},"content":{"rendered":"

What is Euclid Division Algorithm<\/strong><\/h2>\n

\"\"<\/p>\n

Euclid\u2019s Division Lemma:<\/strong>
\nFor any two positive integers a <\/strong>and b<\/strong>, there exist unique integers q and r satisfying a = bq + r, where 0\u00a0\u2264\u00a0r < b.
\nFor Example<\/strong>
\n(i) Consider number 23 and 5, then:
\n23 = 5 \u00d7 4 + 3
\nComparing with a = bq + r; we get:
\na = 23, b = 5, q = 4, r = 3
\nand 0 \u2264\u00a0r < b (as 0 \u2264\u00a03 < 5).
\n(ii)\u00a0 Consider positive integers 18 and 4.
\n18 = 4 \u00d7 4 + 2
\n\u21d2 For 18 (= a) and 4(= b) we have q = 4,
\nr = 2 and \u00a00 \u2264\u00a0r < b.
\nIn the relation a = bq + r, where 0 \u2264\u00a0r < b is nothing but a statement of the long division of number a by number b in which q is the quotient obtained and r is the remainder.
\nThus, dividend = divisor \u00d7 quotient + remainder \u21d2\u00a0a = bq + r
\nH.C.F. (Highest Common Factor) <\/strong>
\nThe H.C.F. of two or more positive integers is the largest positive integer that divides each given positive number completely.
\ni.e., if positive integer d<\/strong> divides two positive integers a<\/strong> and b<\/strong> then the H.C.F. of a<\/strong> and b<\/strong> is d<\/strong>.
\nFor Example<\/strong>
\n(i)\u00a0\u00a0 14 is the largest positive integer that divides 28 and 70 completely; therefore H.C.F. of 28 and 70 is 14.
\n(ii) H.C.F. of 75, 125 and 200 is 25 as 25 divides each of 75, 125 and 200 completely and so on.
\nUsing Euclid\u2019s Division Lemma For Finding H.C.F.<\/strong>
\nConsider positive integers 418 and 33.
\nStep-1<\/strong>
\nTaking bigger number (418) as a<\/strong> and smaller number (33) as b<\/strong>
\nexpress the numbers as a = bq + r
\n\u21d2 418 = 33 \u00d7 12 + 22\u00a0<\/strong>
\nStep-2<\/strong>
\nNow taking the divisor 33 and remainder 22; apply the Euclid\u2019s division algorithm to get:
\n33 = 22 \u00d7 1 + 11 \u00a0\u00a0[Expressing as a = bq + r]
\nStep-3<\/strong>
\nAgain with new divisor 22 and new remainder 11; apply the Euclid\u2019s division algorithm to get:
\n22 = 11 \u00d7 2 + 0
\nStep-4<\/strong>
\nSince, the remainder = 0 so we cannot proceed further.
\nStep-5<\/strong>
\nThe last divisor is 11 and we say H.C.F. of 418 and 33 = 11
\nVerification :<\/strong>
\n(i) Using factor method:<\/strong>
\n\u2234\u00a0Factors of 418 = 1, 2, 11, 19, 22, 38, 209 and 418 and,
\nFactor of 33 = 1, 3, 11 and 33.
\nCommon factors = 1 and 11
\n\u21d2 Highest common factor = 11 i.e., H.C.F. = 11
\n(ii)\u00a0 Using prime factor method:<\/strong>
\nPrime factors of 418 = 2, 11 and 19.
\nPrime factors of 33 = 3 and 11.
\n\u2234\u00a0H.C.F.<\/strong> = Product of all common prime factors\u00a0 = 11.
\nFor any two positive integers a and b which can be expressed as a = bq + r, where 0 \u2264 r < b, the, H.C.F. of (a, b) = H.C.F. of (q, r) and so on. For number 418 and 33
\n418 = 33 \u00d7 12 + 22
\n33 = 22 \u00d7 1 + 11
\nand 22 = 11 \u00d7 2 + 0
\n\u21d2 H.C.F. of (418, 33) = H.C.F. of (33, 22)
\n\u21d2 H.C.F. of (22, 11) = 11.<\/p>\n

Euclid Division Algorithm Example Problems With Solutions<\/strong><\/h2>\n