Knowledge in Class XII

Real Numbers - Ncert Solutions for Class 10 Maths CBSE

Chapter 1 - Real Numbers Excercise Ex. 1.1Solution 1(i) 135 and 225 Step 1:  Since 225 > 135, apply Euclid's division lemma, to a =225 and b=135 to find q and r  such that 225 = 135q+r, 0  r<135 On dividing 225 by 135 we get quotient as 1 and remainder as 90 i.e 225 = 135 x 1 + 90 Step 2: Remainder r which is 90  0, we apply Euclid's division lemma to b =135 and r = 90 to find whole numbers q and r such that 135 = 90 x q + r, 0  r<90On dividing 135 by 90 we get quotient as 1 and remainder as 45i.e 135 = 90 x 1 + 45Step 3:  Again remainder r = 45  0 so we apply Euclid's division lemma to b =90 and r = 45 to find q and r  such that 90 = 90 x q + r,  0  r<45On dividing 90 by 45 we get quotient as 2 and remainder as 0 i.e 90 = 2 x 45 + 0Step 4: Since the remainder is zero, the divisor at this stage will be HCF of (135, 225). Since the divisor at this stage is 45, therefore, the HCF of 135 and 225 is 45. (ii)   196 and 38220Step 1:  Since 38220 > 196, apply Euclid's division lemmato a =38220 and b=196 to find whole numbers q and r  such that 38220 = 196 q + r, 0  r < 196On dividing 38220 we get quotient as 195 and remainder r as 0 i.e 38220 = 196 x 195 + 0Since the remainder is zero, divisor at this stage will be HCF Since divisor at this stage is 196 , therefore, HCF of 196 and 38220 is 196.NOTE: HCF( a,b) = a if a is a factor of b. Here, 196 is a factor of 38220 so HCF is 196. (iii)   867 and 255 Step 1: Since 867 > 255, apply Euclid's division lemma, to a =867 and b=255 to find q and r  such that 867 = 255q + r, 0  r<255On dividing 867 by 255 we get quotient as 3 and remainder as 102i.e 867 = 255 x 3 + 102 Step 2: Since remainder 102  0, we apply the division lemma to a=255 and b= 102 to find whole numbers q and r such that 255 = 102q + r where 0  r<102On dividing 255 by 102 we get quotient as 2 and remainder as 51 i.e 255 = 102 x 2 + 51Step 3: Again remainder 51 is non zero, so we apply the division lemma to a=102 and b= 51 to find whole numbers q and r such that 102 = 51 q + r where 0 r < 51  On dividing 102 by 51 quotient is 2 and remainder is 0i.e 102 = 51 x 2 + 0Since the remainder is zero, the divisor at this stage is the HCFSince the divisor at this stage is 51,therefore, HCF of 867 and 255 is 51. Concept Insight: To crack such problem remember to apply the Euclid's division Lemma which states that "Given positive integers a and b, there exists unique integers q and r satisfying a = bq + r, where 0  r < b" in the correct order. Here, a > b. Euclid's algorithm works since Dividing 'a' by 'b', replacing 'b' by 'r' and 'a' by 'b' and repeating the process of division till remainder 0 is reached, gives a number which divides a and b exactly. i.e   HCF(a,b) =HCF(b,r)Note that do not find the HCF using prime factorisation in this question when the method is specified and do not skip steps.

Information about the SECOND HAND books at reasonable rates

The books categories consist of : 1. JEE MAIN Entrance exam, solved question papers book for last 38 years for all the 3 subjects Chemistry, Physics, Maths. 2. Class 12 CBSE books and guides( U-like, Ncert books, Arihant for different subjects. etc.) 3. For classes, lower than class 11 and some books of engineering are also available. All the class 11 and Class 12 books are only 3 years old so they are of the latest edition and syllabus. Interested buyers contact 9560166751 for rates. Location: Delhi For Delivery outside Delhi, Transportation will be charged as applicable and 80% Payment will be taken advance. All modes of payment are available.


We feel immense pleasure in bringing the 'December 2018' edition of our very own 'Masters in Current Affairs', a platform where you get all the exam related information at a single place. It is designed especially for the forthcoming examinations. Its regular sections such as News Maker, News Diary, One-liners etc. cover each and every news in details which is important for examinations. Rest of the news are covered in 'Chalte - Chalte' i.e. one-liner news, which you can find at the bottom of each page. Some important issues of this month were discussed in featured articles. One among them is ‘#Me too MOVEMENT’, with many local and international alternatives, is a movement against sexual harassment and sexual assault.#MeToo spread virally in October 2017 as a hashtag used on social media in an attempt to demonstrate the widespread prevalence of sexual assault and harassment, especially in the workplace. The #MeToo campaign helped women from all around the world in throwing light on sexual abuse. Not only that, it also gave women the opportunity to support each other, to empower themselves and to have a chance to talk about a serious issue that usually remains in the dark. And all the minute details are mentioned inside. Then an article about ‘END OF SECTION 497 ‘, The Supreme Court's decision to scrap Section 497 of the Indian Penal Code, thereby decriminalising adultery, cannot be seen as a cheer for promiscuity. The fact is that adultery won't get any less harmful for marriage just because it no longer comes under the purview of being a criminal act. On the contrary, the psychological damage to a marriage is mutually exclusive from legal fiat. The law cannot re-ignite the dying embers of a marriage scorched by suspicion and much more is given the whole article. Later we’ll see ‘RUPEE CRISIS’, as INDIA could be braced to see its financial troubles deepen, with the rupee languishing even further before stabilizing against the US dollar, according to an economic analyst. The rupee has been crippled by soaring oil prices and higher interest rates, with the crisis-hit currency losing around 15 percent of its value versus the American tender. The Indian currency breached the 74-mark for the first time ever against the US dollar this month, but the worst could still be yet to come for the rupee. And all the other important details are mentioned inside. And an article about ‘NOBLE PRIZE 2018’, The Nobel Prize in Physics 2018 was awarded “for groundbreaking inventions in the field of laser physics” with one half to Arthur Ashkin “for the optical tweezers and their application to biological systems” and the other half jointly to Gérard Mourou and Donna Strickland “for their method of generating high-intensity, ultra-short optical pulses” and much more in the article given inside. In this edition, we are providing the complete solution of IBPS CLERK (PRE) 2018 and CDS MODEL PAPER for your self-assessment. There is a separate section named Que.-TM for your self-evaluation, which includes all the possible MCQ's from this month's current affairs. This will be highly beneficial for all the upcoming examinations. Your advice or suggestions will be much appreciated and welcomed.

Single Phase Study Papers

this is topic of single phase study here we study only one topic which important for board exam as well multiple and single questions answered


Cbse Biology is deeply study subjects through it can achieve your truly goals by deserving candidates can be part this go thoroughly agin I am saying it will impact on Score


Chemistry board exam papers will important for cbse paper as well in jee mains and advanced paper will help to score good marks

GDP Knowledge Ppt Financial

GDP is india growth development which need to grow up with so many fundamental ideas it requires a amoung whole company to understand inside theory which start the growth

Cbse Maths Board Exam Paper

Cbse is based on questions which will help to improve good marks on their test this will ask same question again it self so be prepared for good scoring

Maths Previous Year Paper

this well and good maths cbse year paper this question is repeated again Thier based on these types of questions answered is short and solve each and every problem based on different methods

Imp.topics to crack jee

Physics important topics to crack jee mains easily and got opportunities of take admission on Indias top NIT's..........thanks you😊

Imp.topics of maths

Important topics of maths to crack jee mains easily and got opportunities to take admission on Indias top NIT's.....thanks you😊