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Media > TDT > Mental computation > MC_GT_T1_E3_A1_fig2

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MC_GT_T1_E3_A1_fig2

MC_GT_T1_E3_A1_fig2

Screen grab from L98 The take-away bar: make your own hard subtractions.
Source: © Education Services Australia, 2011.

Problem of 90 minus 30, with a diagrammatic representation.