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Media > TDT > Mental computation > MC_B1_I1_E1_fig1

MC_B1_I1_E1_fig1

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Problem of 28 + 36 shown as start at 0, jump 20 to 20, then jump 30 to 50, then jump 8 to 58 then jump 6 to 64.

Use of an empty number line.

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