2桁同士の乗算

(1)

31
×
 
＝
2728

(2)

91
×
 
＝
4641

(3)

 
×
92
＝
3680

(4)

 
×
50
＝
700

(5)

37
×
 
＝
3182

(6)

 
×
50
＝
2500

(7)

 
×
34
＝
1938

(8)

52
×
 
＝
4524

(9)

 
×
13
＝
611

(10)

 
×
69
＝
3588

(11)

 
×
79
＝
3476

(12)

51
×
 
＝
3315

(13)

18
×
 
＝
414

(14)

 
×
61
＝
4270

(15)

 
×
40
＝
2840

(16)

 
×
80
＝
6320