Correcto: 9 x30= 270, 10 x 20 = 200, 30 + 29 = 59, 30- 7= 23, 150: 3= 50, 140: 7= 20, 21X5= 105, 125 + 5=130, 600: 3= 200, 120 -110= 10, 364+ 300= 694, 1.000: 20 = 50, 67+30= 97, 30x 2= 60, 60x 100 = 6000, 300-150= 150, Incorrecto: 5x 40 =210, 10 x 5 =60, 50 + 18 = 60, 52 - 50 = 1, 10:5= 5, 84: 2 =43, 61 X 3=180, 500+ 10 = 501, 600: 2=302, 58-4= 55, 145+ 10= 165, 150:5=20, 84 +120 =105, 120x 3= 350, 14 + 7= 20, 720-19= 708,

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