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Media > TDT > Mental computation > MC_GT_T1_E2_A2_fig1

MC_GT_T1_E2_A2_fig1

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

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

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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.

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Problem of 60 plus 40, broken into 60 plus four lots of 10, with a diagrammatic representation.

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Problem is 28 plus 7, broken into 28 plus 2 plus 5 to equal 35.

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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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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 90 minus 30, with a diagrammatic representation.

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