2桁同士の乗算

(1)

 
×
80
＝
5600

(2)

 
×
56
＝
3080

(3)

 
×
29
＝
870

(4)

13
×
 
＝
1105

(5)

 
×
93
＝
5952

(6)

 
×
91
＝
6734

(7)

90
×
 
＝
1890

(8)

 
×
72
＝
5688

(9)

51
×
 
＝
3927

(10)

 
×
47
＝
4136

(11)

 
×
52
＝
3120

(12)

46
×
 
＝
2346

(13)

 
×
19
＝
1444

(14)

 
×
16
＝
1024

(15)

 
×
23
＝
1219

(16)

 
×
77
＝
6237