To find the width of the scale drawing of the toddler room, you can set up a proportion/ratio.
2.5 m/4 m= 5 cm/x cm
To get from 2.5 to 5, you multiplied by 2, so you will do the same thing to 4 to find the missing scale width.
4 x 2 = 8 cm
The width of the scale drawing is 8 cm.