It got learnt in 4rd grade (NSW) in 1971
as did these little gems:
Code:
12 inches = 1 foot
3 feet = 1 yard
5.5 yards = 1 rod = 1 pole = 1 perch
4 rods = 1 chain
10 chains = 1 furlong
8 furlongs = 1 mile
3 miles = 1 league
6 feet = 1 fathom
25 links = 1 rod
1 perch = 1 rod x 1 rod
1 rood = 1 furlong x 1 rod
1 acre = 1 furlong x 1 chain
40 perches = 1 rood
4 roods = 1 acre
640 acres = 1 section = 1 sq mile
36 sections = 1 township
In the middle of 5th grade they took away our Imperial Maths books and replaced them with otherwise identical Metric editions.