ISBN-13: 9780367495442 / Angielski / Twarda / 2020 / 256 str.
ISBN-13: 9780367495442 / Angielski / Twarda / 2020 / 256 str.
First published in 1982, this work represents one of the first attempts to bring together the perspectives of a variety of different researchers investigating a specific, well defined content domain. It presents theoretical views and research findings investigating the early acquisition of addition and subtraction skills by young children.