Abstract: The invention provides a child's counting or activity book having successive leaves formed with ascending numbers of sockets for mounting corresponding numbers of individual button-like, counters of a set. Each counter is anchored to a spine region by a ribbon permitting movement of the counter between any sockets. The counters are selected by the child according to instructions provided on a facing page by words, arabic numbers and illustrations of the corresponding counters. All counters of the set are initially mounted in through-sockets in the cover for storage and display.