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Calculeaza si efectueaza proba folosind comutativitatea inmultirii 4x12,23x3,2x36,3x44,14x5,32x6 2)Calculeaza grupind convenabil termeni;8x7x0,7x4x2,2x9x5,3x7x2,5x10x5,10x9x9,5x8x2 ,4x9x2,2x3x7, 3) Efectueaza in doua moduri 5x(5+2),8x(6-3),(2+4)x9,(5-3)x6,(3+2+4)x10,(5+1+2)x9 ,8x(7-3),10x(4+3-2)