In developing an experimental mathematics inventory for assessing youngsters entering school, Rey and Rea (1970) worked with kindergarten children. They found that 75% could count by rote beyond 10 and 37% could count to or beyond 20, both by rote rationally. This test did not assess ability to used arithmetic operations, except incidentally in some test s of obtaining change (e.g., "If this costs 2c, how much change will you get from a nickel?").