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Media > TDT > Mental computation > MC_GT_T1_E5_A2_fig34

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MC_GT_T1_E5_A2_fig34

MC_GT_T1_E5_A2_fig34

Screen grabs from L110 The difference bar: make your own hard subtractions.
Source: © Education Services Australia, 2011

Sets the problem of working out the difference between 27 and 63 and suggests that the solution be in the form of 27 + ? = 63.