If a rectangle measures 8 feet on the short side and 9.8 feet on the long side.What is the area of the rectangle in square feet?

2 Answers
Apr 20, 2018

#A=78.4# #"ft"^2#

Explanation:

Multiply the length and width of the rectangle to find its area:

#A=9.8*8#

#A=78.4# #"ft"^2#

Remember your units!

Apr 20, 2018

If the decimal is giving you a problem consider this approach.

#78.4 color(white)(.)ft^2#

Explanation:

We have: #8" feet"xx9.8" feet"#

But 9.8 is the same as #98xx1/10#

So re-write as:

#8xx98xx1/10 " ft"^2#

#color(white)("d")color(white)(.)9color(white)(..)8#
#ul(color(white)("d")color(white)(9999)8larr" Multiply")#
#ul(7color(white)(.)8color(white)(..)4)#
#color(white)("dd")6#

Now we multiply by #1/10# to give:

#784 color(white)(.)ft^2xx1/10= 78.4 color(white)(.)ft^2#