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Media > TDT > Mental computation > MC_GT_T1_E5_A2_fig1

MC_GT_T1_E5_A2_fig1

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A pair of counting strips marked from 1 to 15, the upper one showing the difference between 8 and 13 and the lower the difference between 10 and 15. Finding the difference between 8 and 13 is harder than finding the difference between 10 and 15.

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10 by 10 multiplication grid with different colours showing the zero products, the ones products, the double ones, the double twos, the double threes, the double fours, and the relating to tens.

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