MC_GT_T1_E5_A1_fig1

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Problem of 62 minus 28, with a diagrammatic representation of 28 added to 30 to give 58, leaving 4 to reach 62.

Screen grab from L112 The difference bar: generate hard differences.
Source: © Education Services Australia, 2011.

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

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

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Problem of 62 minus 28, with a diagrammatic representation of 2 added to 28 to give 30, leaving 32 plus the remaining 2 to reach 64.

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