by David Kirkby, Ruth Merttens · Ginn & Co · tapa blanda · ISBN 9780602290801
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«New Abacus 4: Number Textbook 2» is the math textbook by David Kirkby and Ruth Merttens, published by Ginn & Co in paperback (72 pages, in English).
Math textbook for level 4 of the Abacus series, aimed at independent practice of number skills. It presents concepts in language suited to students' reading and includes investigative and process activities that stimulate creative and mathematical reasoning, along with problem-solving exercises.
It belongs to the New Abacus series (1999), level Year 4 / P5, and was published in April 2000. The title also appears as «1999 Abacus Year 4 / P5: Textbook Number 2».
Practice material for students at Year 4 / P5 level within the New Abacus series, used in elementary school to reinforce number skills.
David Kirkby is a cosmologist and professor at the department of physics and astronomy at University of California, Irvine (UCI).
