Hand (unit) divided by four, then the remainder is added after the radix point. Thus, a horse that measures 60 inches is 15 hands high (15 x 4 = 60) and a horse halfway between 15 and 16 hands is 15.2 hands, or 62 inches tall (15 x 4 + 2 = 62) Because the subdivision of a hand is a base 4 system, a horse 64 inches high is 16.0 hands high, not 15.4. A designation of "15.5 hands" is not halfway between 15 and 16 hands, but rather reads 15 hands and five inches, an impossibility in a base 4
History of the horse in Britain Act aimed at improving the height and strength of horses; no stallion under and no mare under 13 hands (52 inches, 132 cm) was permitted to run out on common land, or to run wild, and no two-year-old colt under 11.2 hands (46 inches, 117 cm) was allowed to run out in any area with mares. Annual round-ups on common land were enforced, and any stallion under the height limit was ordered to be destroyed, along with "all unlikely [small horses] whether mares or foals". Henry VIII also established a stud for breeding imported horses such as the Spanish Jennet,