It's 12 meters long and 4 meters wide. How many square meters is it,

It's 12 meters long and 4 meters wide. How many square meters is it,

Generally, houses are rectangular (i.e. Square). According to the rectangular area formula s = a * B, i.e. length multiplied by width, the area of this piece of land is 12 * 4 = 48 square meters!
Can also calculate the price, with the area multiplied by the unit price (that is, how much per square meter) is the price of this land!

A conference room is 15 meters long, 12 meters wide and 4 meters high. How many square meters of floor tiles do you need? Paint its four walls and top surface, in addition to the area of 20 square meters of doors and windows, to paint the area of how many square meters?

(1) 15 × 12 = 180 (square meters); answer: floor tile 180 square meters. (2) 15 × 12 + (15 × 4 + 12 × 4) × 2-20, = 180 + (60 + 48) × 2-20, = 180 + 108 × 2-20, = 180 + 216-20, = 376 (square meters); answer: the actual area to be painted is 376 square meters

A fence with a length of 15 meters and a width of 4 meters, with an average of 2 flowers per square meter, a total of 15 × 4 × 2, right

Yes