Complement numbers on an adding machine c. 1910. The smaller numbers, for use when subtracting, are the nines’ complement of the larger numbers, which are used when adding.
(echo:: @ ᯤ)
Complement numbers on an adding machine c. 1910. The smaller numbers, for use when subtracting, are the nines’ complement of the larger numbers, which are used when adding.
(echo:: @ ᯤ)