Video narration
How can you count every tile on a floor without counting one by one? Here, three rows hold six tiles each: six plus six plus six equals eighteen square units. Since each row repeats, multiply three by six: eighteen. Same count, faster. Tiles across give length; rows give width. Rectangle area is length times width: A equals l times w. Eight by four is thirty-two square units. A square has equal sides: five times five is twenty-five, or side times side. A equals s squared. Area counts square tiles covering a region: twelve square units, not twelve units. Quick checks: seven by two, fourteen; six times six, thirty-six; nine by three, twenty-seven; ten by four, forty. Now compare: twelve by five is sixty square units; seven by seven is forty-nine. The rectangle is larger. Count rows of floor tiles times tiles across; for a rectangle, that's length times width.