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'My Book of Subtraction' looks to build upon the key skills acquired in 'My Book of Simple Subtraction'; the eventual aim being to prepare children for higher-level mathematics by improving their basic subtraction skills. This title begins by practicing how to subtract numbers one to nine, before reinforcing this and extending the process to 20.

My Book of Subtraction 2005, Kumon Publishing North America, Tokyo

ISBN-13: 9781933241074

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