10 - 5+5, 30 - 15+15, 100 - 50+50, 40 - 20+20, 15 - 6+9, 50 - 25+25, 70 - 35+35, 80 - 40+40, 90 - 45+45, 60 - 20+40,

CALCULOS MENTALES: sumas

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