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Ex 12.2, 4 - In a stack there are 5 books each of thickness 20mm

Ex 12.2, 4 - Chapter 12 Class 8 Exponents and Powers - Part 2
Ex 12.2, 4 - Chapter 12 Class 8 Exponents and Powers - Part 3

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Ex 12.2, 4 In a stack there are 5 books each of thickness 20mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack. Total thickness = Thickness of books + Thickness of paper sheets Thickness of books Number of books = 5 Thickness of 1 book = 20mm Thickness of 5 books = 5 × 20mm = 100 mm Thickness of paper sheets Number of sheets = 5 Thickness of 1 sheet = 0.016 mm = 16/1000 mm Thickness of 5 sheets = 5 × 16/1000 mm = 80/1000 mm Now, Total thickness = Thickness of books + thickness of paper sheets = 100 + 80/1000 = 100 + 8/100 = (100 × 100 + 8)/100 = (10000 + 8)/100 = 10008/100 = 10008/〖10〗^2 = 10008×〖10〗^(−2) = (1.0008×〖10〗^4 )×〖10〗^(−2) = 1.0008×(〖10〗^4×〖10〗^(−2) ) = 1.0008×〖10〗^(4 + (−2)) = 1.0008×〖10〗^(4 − 2) = 𝟏.𝟎𝟎𝟎𝟖×〖𝟏𝟎〗^𝟐 mm (Using 𝑎^𝑚×𝑎^𝑛=𝑎^(𝑚 + 𝑛))

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Davneet Singh has done his B.Tech from Indian Institute of Technology, Kanpur. He has been teaching from the past 13 years. He provides courses for Maths, Science, Social Science, Physics, Chemistry, Computer Science at Teachoo.