Merttens Ruth, Kirkby David:
New Abacus 4: Challenge Book
Pearson Education, Oxford (United Kingdom), 2000
Paperback
ISBN: 9780602290856
ISBN-10: 0602290856
New Abacus 4: Challenge Book
Aimed at pupils requiring further enrichment and extension, the challenge books develop able pupils' mathematical understanding within a unit. They use open-ended and problem solving activities, but require minimum teacher input and minimum use of additional materials.
