2桁同士の乗算

(1)

58
×
21

(2)

92
×
88

(3)

45
×
44

(4)

58
×
71

(5)

47
×
25

(6)

87
×
4

(7)

31
×
45

(8)

10
×
21

(9)

70
×
44

(10)

2
×
81

(11)

92
×
1

(12)

23
×
70

(13)

12
×
88

(14)

32
×
60

(15)

42
×
16

(16)

91
×
70