Last updated
22 February 2018
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Practises using the diagrammatic form of the mental operation as used in Singapore text books.
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Just what I wanted!
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Thank you . Nice method and layout<br />
Thank you. I think this is a good approach because it really offers a strong mental strategy, rather than a heavy handed written algorithm.
Empty reply does not make any sense for the end user
Empty reply does not make any sense for the end user
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