vero: 1+9=10, 10+90=100, 10-4=6, 100-50=50, 8+8=16, 80+80=160, 9+9=18, 7+7=14, 12-6=6, 5+5+5+5=20, 5x2=10, 8x2=16, 2x8=16, 50x2=100, 25+25=50, 30+30=60, 15+15=30, Falso: 90+2=87, 78-70=54, 55+54=79, 14-3=3, 80+20=94, 12-10=10, 100+4=54, 90-30=41, 200-100=57, 10x2=30, 2+2+2=4, 10-3=11, 10+10+10=23, 100-20=120, 3+3+3= 6, 60-50= 80, 4+4= 6,
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CALCOLO MENTALE previsioni
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Luciaanselmi1
2ª primaria
Matematica
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