Răspuns:A. 342 x 2 = 684
proba:684 : 2 = 342
B. 1323 x 3 = 3969
proba: 3969 : 3 = 1323
1323 x 8 = 10584
proba: 10584 : 8 = 1323
C. 12 x 13 = 156
proba: 156 : 13 = 12
12 x 64 = 768
proba: 768 : 64 = 12
243 x 122 = 29646
proba: 29646 : 122 = 243
243 x 456 = 110808
proba: 110808 : 456 = 243