If you have a calculator just turn it on and typ[ what follows.
[X] means you press the multiplication key
[=] means you press the = key
[+] means you press the addition key (plus)
16 [x]14 [=] area of first room.in square feet
14[X]5[=] area of second room.in square feet
13[X] 13= area of third room in square feet
If you want to obtain the total area of all the rooms at one go
16 [x]14 [+] 14[X]5 [+]13[X]13 [=]
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