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MC_GT_T1_E2_A2_fig1

MC_GT_T1_E2_A2_fig1

Screen grab from L97 The takeaway bar: make your own easy subtractions.
Source: © Education Service Australia, 2011.

The problem 24 minus 8 solved by subtracting 4 from 20 and then adding 4, with a diagrammatic representation.