add, sub 2 Imperial Numbers 1'2"1/8 + 1'1"2/8 = 2'3"3/8.. also center which centers the small number inside the bigger number tells you the strarting number to the outside of the smaller number from the bigger number..
add, sub 2 Imperial Numbers 1'2"1/8 + 1'1"2/8 = 2'3"3/8.. also center which centers the small number inside the bigger number tells you the strarting number to the outside of the smaller number from the bigger number..