266
A good way to do that mentally would be to make 19 into 20. 14 x 20 = 280, simple mental math. Then just subtract 14 from 280. 266
319
266 (14x19) square feet is 24.71 square meters.
10 x 10 = 100 9 x 10 = 90 4 x 10 = 40 4 x 9 = 36 100 + 90 + 40 + 36 = 266 14 x 19 = 266