Question

Each piece of cardboard is $0.3cm$ thick. If Marie stacks $8$ pieces of cardboard on top of one another, how thick will the stack be?

• A. $2.4cm$
• B. $24cm$
• C. $2.1cm$
• D. $21cm$

Answer 1

Answer: (A)

$2.4cm$

It is given that each piece of cardboard is $0.3$ cm thick which means that one piece is $0.3$ cm thick.

If Marie stacks $8$ pieces of cardboard, then the thickness of $8$ pieces of cardboard will be:

$0.3\times 8=2.4$ cm

Hence, the stack will be $2.4$ cm thick.