{"id":95428,"date":"2019-10-04T11:20:08","date_gmt":"2019-10-04T05:50:08","guid":{"rendered":"https:\/\/www.cbselabs.com\/?p=95428"},"modified":"2021-09-18T15:16:26","modified_gmt":"2021-09-18T09:46:26","slug":"ncert-solutions-for-class-8-maths-chapter-12-exponents-and-powers-ex-12-2","status":"publish","type":"post","link":"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-maths-chapter-12-exponents-and-powers-ex-12-2\/","title":{"rendered":"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2"},"content":{"rendered":"<h2>NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2<\/h2>\n<ul>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-maths-chapter-12-exponents-and-powers\/\" target=\"_blank\" rel=\"noopener noreferrer\">Class 8 Maths Exponents and Powers Exercise 12.1<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-maths-chapter-12-exponents-and-powers-ex-12-2\/\" target=\"_blank\" rel=\"noopener noreferrer\">Class 8 Maths Exponents and Powers Exercise 12.2<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/exponents-and-powers-ncert-extra-questions-for-class-8-maths-chapter-12\/\">Exponents and Powers Class 8 Extra Questions<\/a><\/li>\n<\/ul>\n<p><strong>NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Exercise 12.2<\/strong><\/p>\n<p>Ex 12.2 Class 8 Maths Question 1.<br \/>\nExpress the following numbers in standard form:<br \/>\n(i) 0.0000000000085<br \/>\n(ii) 0.00000000000942<br \/>\n(iii) 6020000000000000<br \/>\n(iv) 0.00000000837<br \/>\n(v) 31860000000<br \/>\nSolution:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-106536\" src=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.png?resize=342%2C355&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q1\" width=\"342\" height=\"355\" srcset=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.png?w=342&amp;ssl=1 342w, https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.png?resize=289%2C300&amp;ssl=1 289w\" sizes=\"(max-width: 342px) 100vw, 342px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106535\" src=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.1.png?resize=318%2C311&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q1.1\" width=\"318\" height=\"311\" srcset=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.1.png?w=318&amp;ssl=1 318w, https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q1.1.png?resize=300%2C293&amp;ssl=1 300w\" sizes=\"(max-width: 318px) 100vw, 318px\" data-recalc-dims=\"1\" \/><br \/>\n(v) 31860000000<br \/>\n= 3.186 \u00d7 10000000000<br \/>\n= 3.186 \u00d7 10<sup>10<\/sup><br \/>\nHence, the required standard from = 3.186 \u00d7 10<sup>10<\/sup><\/p>\n<p>Ex 12.2 Class 8 Maths\u00a0Question 2.<br \/>\nExpress the following numbers in usual form.<br \/>\n(i) 3.02 \u00d7 10<sup>-6<\/sup><br \/>\n(ii) 4.5 \u00d7 10<sup>4<\/sup><br \/>\n(iii) 3 \u00d7 10<sup>-8<\/sup><br \/>\n(iv) 1.0001 \u00d7 10<sup>9<\/sup><br \/>\n(v) 5.8 \u00d7 10<sup>12<\/sup><br \/>\n(vi) 3.61492 \u00d7 10<sup>6<\/sup><br \/>\nSolution:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-106539\" src=\"https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.png?resize=319%2C580&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q2\" width=\"319\" height=\"580\" srcset=\"https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.png?w=319&amp;ssl=1 319w, https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.png?resize=165%2C300&amp;ssl=1 165w\" sizes=\"(max-width: 319px) 100vw, 319px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106537\" src=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.1.png?resize=318%2C378&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q2.1\" width=\"318\" height=\"378\" srcset=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.1.png?w=318&amp;ssl=1 318w, https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q2.1.png?resize=252%2C300&amp;ssl=1 252w\" sizes=\"(max-width: 318px) 100vw, 318px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Ex 12.2 Class 8 Maths\u00a0Question 3.<br \/>\nExpress the number appearing in the following statements in standard form.<br \/>\n(i) 1 micron is equal to \\(\\frac { 1 }{ 1000000 }\\) m.<br \/>\n(ii) Charge of an electron is 0.000,000,000,000,000,000,16 coulomb<br \/>\n(iii) Size of a bacteria is 0.0000005 m<br \/>\n(iv) Size of a plant cell is 0.00001275 m<br \/>\n(v) Thickness of a thick paper is 0.07 mm.<br \/>\nSolution:<br \/>\n<img loading=\"lazy\" class=\"alignnone size-full wp-image-106541\" src=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.png?resize=312%2C218&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q3\" width=\"312\" height=\"218\" srcset=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.png?w=312&amp;ssl=1 312w, https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.png?resize=300%2C210&amp;ssl=1 300w\" sizes=\"(max-width: 312px) 100vw, 312px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106540\" src=\"https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.1.png?resize=350%2C576&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Q3.1\" width=\"350\" height=\"576\" srcset=\"https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.1.png?w=350&amp;ssl=1 350w, https:\/\/i2.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-Q3.1.png?resize=182%2C300&amp;ssl=1 182w\" sizes=\"(max-width: 350px) 100vw, 350px\" data-recalc-dims=\"1\" \/><\/p>\n<p>Ex 12.2 Class 8 Maths\u00a0Question 4.<br \/>\nIn a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?<br \/>\nSolution:<br \/>\nThickness of books = 5 \u00d7 20 = 100 mm<br \/>\nThickness of 5 paper sheets = 5 \u00d7 0.016 mm = 0.080 mm.<br \/>\nTotal thickness of the stack = 100 mm + 0.080 mm = 100.080 mm = 1.0008 \u00d7 10<sup>2<\/sup> mm<\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106542\" src=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-1.png?resize=335%2C344&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 q-1\" width=\"335\" height=\"344\" srcset=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-1.png?w=335&amp;ssl=1 335w, https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-1.png?resize=292%2C300&amp;ssl=1 292w\" sizes=\"(max-width: 335px) 100vw, 335px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106543\" src=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-2.png?resize=348%2C364&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 q-2\" width=\"348\" height=\"364\" srcset=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-2.png?w=348&amp;ssl=1 348w, https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-2.png?resize=287%2C300&amp;ssl=1 287w\" sizes=\"(max-width: 348px) 100vw, 348px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106544\" src=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-3.png?resize=662%2C707&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 q-3\" width=\"662\" height=\"707\" srcset=\"https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-3.png?w=662&amp;ssl=1 662w, https:\/\/i0.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-3.png?resize=281%2C300&amp;ssl=1 281w\" sizes=\"(max-width: 662px) 100vw, 662px\" data-recalc-dims=\"1\" \/><\/p>\n<p><img loading=\"lazy\" class=\"alignnone size-full wp-image-106545\" src=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-4.png?resize=615%2C57&#038;ssl=1\" alt=\"NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 q-4\" width=\"615\" height=\"57\" srcset=\"https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-4.png?w=615&amp;ssl=1 615w, https:\/\/i1.wp.com\/www.cbselabs.com\/wp-content\/uploads\/2019\/10\/NCERT-Solutions-for-Class-8-Maths-Chapter-12-Exponents-and-Powers-Ex-12.2-q-4.png?resize=300%2C28&amp;ssl=1 300w\" sizes=\"(max-width: 615px) 100vw, 615px\" data-recalc-dims=\"1\" \/><\/p>\n<h4>More CBSE Class 8 Study Material<\/h4>\n<ul>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-maths\/\">NCERT Solutions for Class 8 Maths<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-science\/\">NCERT Solutions for Class 8 Science<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-social-science\/\">NCERT Solutions for Class 8 Social Science<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-class-8-english\/\">NCERT Solutions for Class 8 English<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-english-honeydew\/\">NCERT Solutions for Class 8 English Honeydew<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-english-it-so-happened\/\">NCERT Solutions for Class 8 English It So Happened<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-for-class-8-hindi\/\">NCERT Solutions for Class 8 Hindi<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-class-8-sanskrit\/\">NCERT Solutions for Class 8 Sanskrit<\/a><\/li>\n<li><a href=\"https:\/\/www.cbselabs.com\/ncert-solutions-2\/\">NCERT Solutions<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 Class 8 Maths Exponents and Powers Exercise 12.1 Class 8 Maths Exponents and Powers Exercise 12.2 Exponents and Powers Class 8 Extra Questions NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Exercise 12.2 Ex 12.2 Class 8 Maths Question &hellip;<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"spay_email":""},"categories":[2],"tags":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v17.2 (Yoast SEO v17.2) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>NCERT Solutions for Class 8 Maths Chapter 12 Exponents and Powers Ex 12.2 - CBSE Labs<\/title>\n<meta name=\"robots\" content=\"index, follow, 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