Imperial systems
Imperial systems
Imperial system, also known as the "British Imperial", is mostly used in Britain and some other Commonwealth countries. Unlike metric units, imperial units are not based on the number of 10. Some of the most commonly used imperial units are inch, pound and arc.
Basic concepts:
 Multiplying fractions and whole numbers
 Multiplying proper fractions
 Multiplying improper fractions and mixed numbers
Related concepts:
 Multiplying decimals
 Ratios
 Rates
Lessons
Notes:
$\cdot$ Mainly used in US and some in Canada
$\cdot$ Not based on number of 10
Lengths
1 foot (ft) = 12 inches (in)
1 yard (yd) = 3 feet (ft)
1 mile (mi) = 1760 yards (yd)

1.
Converting the imperial units

b)
530 in = _____ mi

2.
Add or subtract different imperial units