(5-5) / 45 = 0 (55-10) / 45 = 0 (555-15) / 45 = 12 (5555-20) / 45 = 123 (55555-25) / 45 = 1234 a group of such examples are recommended

(5-5) / 45 = 0 (55-10) / 45 = 0 (555-15) / 45 = 12 (5555-20) / 45 = 123 (55555-25) / 45 = 1234 a group of such examples are recommended

(3-3)/27=0
(33-6)/27=1
(333-9)/27=12
(3333-12)/27=123
(33333-15)/27=1234