Abacus is a simple tool which was used in ancient times for calculating numbers through basic arithmetic system.

MarkJ3318 のブックマーク 2012/08/13 18:11

<blockquote class="hatena-bookmark-comment"><a class="comment-info" href="https://b.hatena.ne.jp/entry/93380470/comment/MarkJ3318" data-user-id="MarkJ3318" data-entry-url="https://b.hatena.ne.jp/entry/s/www.mastermindabacus.com/" data-original-href="https://www.mastermindabacus.com/" data-entry-favicon="https://cdn-ak2.favicon.st-hatena.com/64?url=https%3A%2F%2Fwww.mastermindabacus.com%2F" data-user-icon="/users/MarkJ3318/profile.png">Abacus Classes: Let your child improve himself with experts</a><br><p style="clear: left">Abacus is a simple tool which was used in ancient times for calculating numbers through basic arithmetic system.</p><a class="datetime" href="https://b.hatena.ne.jp/MarkJ3318/20120813#bookmark-93380470"><span class="datetime-body">2012/08/13 18:11</span></a></blockquote><script src="https://b.st-hatena.com/js/comment-widget.js" charset="utf-8" async></script>

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Abacus Classes: Let your child improve himself with experts

www.mastermindabacus.com2012/05/11

MASTERMIND ABACUS PROGRAM IMPROVES YOUR CHILD'S MENTAL MATH AND OVERALL ACADEMIC PERFORMANCE Nurture a Love for Math with Mastermind's Interactive Abacus Classes & Training It is scientifically pro...

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