Question

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?
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Answer 1

Answer:

Given :

There are 5 books is a stack and 5 paper sheet.

• Each book of thickness 20mm.
• Each sheet of thickness 0.016mm.

To Find :

• Total thickness of the stack.

Solution :

To find the total thickness of the stack we have to add total thickness of 5 book with total thickness of 5 paper sheet.

In equation ;-

★ Total thickness = (Total thickness of 5 book + Total thickness of 5 paper)

________________

★ Thickness of 5 book :

1 book = 20mm

5 books = 20 × 5 = 100

Therefore, thickness of 5 book is 100

★ Thickness of 5 paper sheet :

1 sheet = 0.016mm

5 sheet = 5 × 0.016 = 0.08mm

Therefore, thickness of 5 paper sheet is 0.08mm

★ Total thickness :

=> Thickness of 5 book + 5 paper sheet

=> 100 + 0.08mm

=> 100.08mm

=> 1.0008 × 10²

Therefore, total thickness of the stack is 1.0008×10²

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More Information:

m = meter

mm = millimetre

cm = centimetre

km = kilometre

• 1m = 100cm
• 1m = 0.001km
• 1m = 1000mm
• 1km = 1000000mm
• 1km = 100000cm
• 1km = 1000m
• 1cm = 0.01m
• 1cm = 10mm
• 1mm = 0.1cm

Answer 2

Given:-

•5 books each of thickness 20 mm

and

•5 paper sheets each of thickness

0.016mm

To find:-

•Total thickness of the stack.

Solution:-

★ As given in the question We need

to find the thickness of the 5 books

of 20mm and then we will find the

thickness of the sheet and both of

them.

Therefore,

-»-»We will multiply 20mm with 5 and

0.016mm with 5 and we will add

them.

$\footnotesize\underline{\bf{ \longmapsto Thickness_{books}=20mm \times 5}}$

$\footnotesize\underline{\bf{ \implies 100mm}}$

Now we will find the thickness of sheets.

$\footnotesize\underline{\tt{ \longmapsto Thickness_{Sheets}=5×0.016mm}}$

$\footnotesize\underline{\tt{ \implies0.08mm}}$

Now we will add both the thickness of books and sheets.

$\large\underline{\sf{ \longmapsto100 + 0.08}}$

$\large\underline{\sf{ \implies100.08}}$

Now we can convert it to standard form.

$\large \blue{\underline{ \green{ \boxed{ \frak{ \red{ \implies1.0008 \times {10}^{2} }}}}}}$