16 step. Every time you go to the next floor, you have to take 16 steps, that is, you have to take 16 steps from the first floor to the second floor and 16 steps from the second floor to the third floor, so there is 16 steps between the first grade of mathematics. Steps generally refer to buildings built with bricks, stones and concrete for people to get up and down, mostly in front of the gate or on the ramp. The calculation of engineering quantity generally involves the calculation of step engineering quantity.