2桁同士の乗算

(1)

28
×
 
＝
1512

(2)

20
×
 
＝
1600

(3)

 
×
87
＝
4002

(4)

 
×
77
＝
1540

(5)

 
×
41
＝
2665

(6)

72
×
 
＝
3024

(7)

60
×
 
＝
1320

(8)

15
×
 
＝
690

(9)

15
×
 
＝
1200

(10)

 
×
61
＝
732

(11)

89
×
 
＝
4272

(12)

 
×
49
＝
490

(13)

 
×
42
＝
1428

(14)

 
×
44
＝
3036

(15)

 
×
99
＝
1188

(16)

39
×
 
＝
2964