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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 次の計算をしなさい
[1C1-00]
(1)
2
39
(2)
58
×
62
(3)
88
×
92
(4)
2
29
(5)
72
×
68
(6)
2
81
(7)
91
×
89
(8)
87
×
93
(9)
62
×
58
(10)
47
×
53
(11)
71
×
69
(12)
87
×
93
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
39
2
2
2
=
(
40
−
1
)
=
40
−
2
×
40
×
1
＋
1
=
1600
−
80
＋
1
=
1521
(2)
58
×
62
2
2
=
(
60
−
2
)
(
60
＋
2
)
=
60
−
2
=
3600
−
4
=
3596
(3)
88
×
92
2
2
=
(
90
−
2
)
(
90
＋
2
)
=
90
−
2
=
8100
−
4
=
8096
(4)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
＋
1
=
900
−
60
＋
1
=
841
(5)
72
×
68
2
2
=
(
70
＋
2
)
(
70
−
2
)
=
70
−
2
=
4900
−
4
=
4896
(6)
2
81
2
2
2
=
(
80
＋
1
)
=
80
＋
2
×
80
×
1
＋
1
=
6400
＋
160
＋
1
=
6561
(7)
91
×
89
2
2
=
(
90
＋
1
)
(
90
−
1
)
=
90
−
1
=
8100
−
1
=
8099
(8)
87
×
93
2
2
=
(
90
−
3
)
(
90
＋
3
)
=
90
−
3
=
8100
−
9
=
8091
(9)
62
×
58
2
2
=
(
60
＋
2
)
(
60
−
2
)
=
60
−
2
=
3600
−
4
=
3596
(10)
47
×
53
2
2
=
(
50
−
3
)
(
50
＋
3
)
=
50
−
3
=
2500
−
9
=
2491
(11)
71
×
69
2
2
=
(
70
＋
1
)
(
70
−
1
)
=
70
−
1
=
4900
−
1
=
4899
(12)
87
×
93
2
2
=
(
90
−
3
)
(
90
＋
3
)
=
90
−
3
=
8100
−
9
=
8091