+ & – 9 or 11 – Mark Weddell

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Section of 100 square shown for adding or subtracting 9 or 11by using knowledge of 100 square!!

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<embed><a href='http://mathszone.co.uk/calculating/mental-addition-subtraction/9-or-11-mark-weddell/' target='_blank'><h3>+ & – 9 or 11 – Mark Weddell</h3><img src='http://mathszone.co.uk/wp-content/uploads/thumb83.jpg' width='100%' style='max-width:300px;'></a></embed>