Question

In a stack there are 8 books each of thickness 30 mm and 8 paper sheets each of thickness

0.026 mm. What is the total thickness of the stack?​

Answer 1

Answer:

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Step-by-step explanation:

$8x30=240\\8x0.026=0.208\\240+0.208=240.208$

Answer 2

Given:  Number of books are 5, thickness of each book is 20 mm, there are 5 number of sheets and the thickness of each paper sheet is 0.016 mm.

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Need  to find: Total thickness of the stack.

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Total thickness of the stack = thickness of 5 books + thickness of 5 paper sheets.

 

$:\implies \sf 5 \times 20 + 5\times 016\\ \\ :\implies \sf 100 + 0.080\\ \\ :\implies \sf 100.08 mm \times 10^2\ \\ \\ :\implies \underline{\boxed{\mathfrak{100.08}}} ~\bigstar$

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$\therefore \sf{\underline{The ~total ~thickness ~of ~the ~stack ~ 100.08}}$

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         $\boxed{\mid \underline{\overline {\pink{\bf{\bigstar \; Additional \; Information:}}}}\mid}$

• A number expressed in the form of k × 10ⁿ, where k is a terminating decimal such that 1 ≤ k <10 and n is any Integer, is said to be in scientific notation or standard form of notation.  

• In standard exponential notation, the number is always written with only one digit to the left of the decimal.

• If the decimal point moves to the left or the number is large, add the number of places the decimal move to the current exponent of ten.    

• If the decimal point moves to the right or the number is small, subtract the number of places the decimal moves from the current exponent of ten.