Merttens, Ruth Abacus evolve 2: workbook 2 - Harlow Ginn 2012 Teachers who use Abacus Evolve have praised its flexible assessment, planning support, creative teaching and sound mathematical progression. They tell us that this has helped them raise standards, reduce workload and increase confidence in maths. ISBN: 9780602576394 Dewey Class. No.: TR 510 MER-A / MER-A