54 - 34 + 20 =, 70 - 50 + 20 =, 84 - 64 + 20 =, 43 - 25+ 18 =, 105 - 93 + 12 =, 8 - 16 - 8 =, 25 - 5 x 5 =, 6 - 3 x 2=, 20 - 15 + 5 =, 38 - 33 + 5 =,

Calculo mental (+ - x)

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