"Question 4 In 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?
Class 8 Exponents and Powers Page 200"
Answers
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.
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Solution:
Given:
No. Of books= 5
Thickness of each book= 20mm
No.of paper sheets= 5
Thickness of each paper sheets= 0.016mm
Total thickness of the stack= thickness of 5 books + thickness of 5 paper sheets
=5×20 + 5X.016
=100 + 0.080
=100.08 mm
The total thickness of the stack= 1.0008 × 10 ^2 mm
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Hope this will help you.....
Answer:
Total thickness of books=5×20
=100mm
Total thickness of paper=5×0.016
=0.08mm
Total thickness of stack=100+0.08
=100.08mm