Imperial units were not designed on a desk; they grew out of bodies and trade. The inch was a thumb's width (three barleycorns long, by law), the foot was a foot, the yard a king's reach. Because nobody coordinated them, the relationships are whatever history left behind - and they are PROVIDED, never derived: Length: 1 ft = 12 in, 1 yd = 3 ft (= 36 in), 1 mi = 1760 yd. Capacity: 1 cup = 8 fl oz, 1 pt = 2 cups, 1 qt = 2 pt, 1 gal = 4 qt. Mass: 1 lb = 16 oz, 1 ton = 2000 lb. Temperature: degrees Fahrenheit (°F), water freezing at 32°F and boiling at 212°F. Say it plainly: SI asks 'how many tens?'; imperial asks 'what's the relationship THIS time?' - and the reference strip answers it.

Using the reference strip: how many inches are in 1 yard, and how many cups are in 1 quart? -> 1 yd = 3 ft x 12 in = 36 in; 1 qt = 2 pt x 2 cups = 4 cups