LESSON 4                                                                                                                                              Next

Wow!  You made it to second grade.  (I know some of you are thinking, “Wow, he finally put the second grade lesson online!”)  All right, continuing on with the square footage stuff, there are 43,560 square feet in an acre.  You will need to memorize that number to prepare for your license exam.  Now, once you know that 1 acre = 43,560 square feet, then you should know that 2 acres = 87,120 square feet (2 X 43,560 = 87,120).  10 acres = 435,600 square feet.  4.4 acres = 191,664 square feet (4.4 X 43,560 = 191,664).

To find out how many acres you have, then divide by 43,560.  87,120 divided by 43,560 equals 2.  Notice how it works backwards from the formula above.  Don’t change the formula if you have less than an acre.  8,712 square feet divided by 43,560 will give you 0.2 acres.  To know if you did it right, remember there are 43,560 square feet in an acre, so if you have more than 43,560 square feet, the number of acres will be more than one.  If you have less than 43,560, then your answer will be less than one (zero point something).

Next, 1 yard X 1 yard would be 1 square yard.  There are 3 feet in a yard.  1 yard X 1 yard is the same as 3 feet X 3 feet.  3 feet X 3 feet = 9 square feet, therefore, 1 square yard = 9 square feet.

Along the same lines, 1 mile = 5,280 feet. 1 mile X 1 mile = 1 square mile.  1 mile X 1 mile is the same as 5,280 feet by 5,280 feet.  5,280 X 5,280 = 27,878,400 square feet.  27,878,400 divided by 43,560 equals 640 acres.  Therefore, there are 640 acres in a square mile.

Okay, not that you’ll probably need this, but to see if you get the concept, how many square inches are in a square foot?  Guess and then click here for the answer.

There are 144 square inches in a square foot.  12 inches X 12 inches = 144 square inches.

When you multiply out two dimensions, you get area.  When you multiply out three dimensions, you get volume.  When you are finding the area, multiplying the dimensions will give you square inches, square feet, etc.  When you are finding volume, multiplying the dimensions will give you cubic inches, cubic feet, etc.  If you are trying to find the volume of a cube or box or a room, multiply out the three dimensions (length times width times height or L X W X H).  If a room is 10’ X 15” with an 8 foot ceiling (meaning the walls or the room is 8 feet high),

then 10’ X 15’ X 8’ would equal 1200 cubic feet.

Okay, again to see if you are getting all of this, how many cubic feet are in cubic yard?

There are 27 cubic feet in a cubic yard.  3 feet X 3 feet X 3 feet = 27 cubic feet.