Correct: 20+80=100, 9x9=81, 49+11=60, 100+300=400, 150+250=400, 500-150=350, 1000-350=650, 3 x 11=33, 4 x 100 = 400, 77:77 = 1, 245:1 = 245, 26 x 10 = 260, 8 x 8 = 64, 490+110=600, 7001-7000=1, 654-500=154, 542-300=242, 798-70=770, 236+100=336, 451+40=491, 220+220=440, 450+450=900, 16 x 10=160, 7:1=7, 50+60=110, 6780-6779=1, 350+350=700, 320+320=640, 150+150=300, 48x100=4800, Incorrect: 50+60=210, 500+200=300, 550-300=850, 7:1=1, 8:0=8, 6+9000=6009, 4+79=100, 5x11=115, 9000-4000=4000, 800+250=950, 9x9=64, 48x100=48000, 16x10=16, 450+450=1000, 150+150=0, 700-350=150, 34+34=78, 220+220=460, 6780-6679=1, 6780-6700=6700, 3000-3000=9000, 77:77=11, 500-150=650, 20+80=1000, 9x100=90, 430-30=300, 3x11=31, 450-450=900, 3x3=6, 451-40=491,
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Calcolo mentale
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Calcolo mentale
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