2*10 - 10+10, 4*5 - 5+5+5+5, 3*6 - 6+6+6, 5*1 - 1+1+1+1+1, 6*4 - 4+4+4+4+4+4, 2*5 - 5+5+5+5+5,

repeated addition grade 1

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