2桁同士の乗算

(1)

 
×
21
＝
1764

(2)

 
×
52
＝
3432

(3)

 
×
90
＝
8280

(4)

45
×
 
＝
3195

(5)

57
×
 
＝
4047

(6)

24
×
 
＝
504

(7)

83
×
 
＝
3154

(8)

70
×
 
＝
1680

(9)

34
×
 
＝
2516

(10)

49
×
 
＝
2891

(11)

 
×
47
＝
4606

(12)

54
×
 
＝
2376

(13)

 
×
49
＝
1617

(14)

 
×
68
＝
1564

(15)

44
×
 
＝
3036

(16)

19
×
 
＝
1083