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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)
27
×
33
(2)
2
87
(3)
52
×
48
(4)
2
63
(5)
101
×
99
(6)
2
32
(7)
2
81
(8)
47
×
53
(9)
89
×
91
(10)
2
33
(11)
2
51
(12)
2
68
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
27
×
33
2
2
=
(
30
−
3
)
(
30
+
3
)
=
30
−
3
=
900
−
9
=
891
(2)
2
87
2
2
2
=
(
90
−
3
)
=
90
−
2
×
90
×
3
+
3
=
8100
−
540
+
9
=
7569
(3)
52
×
48
2
2
=
(
50
+
2
)
(
50
−
2
)
=
50
−
2
=
2500
−
4
=
2496
(4)
2
63
2
2
2
=
(
60
+
3
)
=
60
+
2
×
60
×
3
+
3
=
3600
+
360
+
9
=
3969
(5)
101
×
99
2
2
=
(
100
+
1
)
(
100
−
1
)
=
100
−
1
=
10000
−
1
=
9999
(6)
2
32
2
2
2
=
(
30
+
2
)
=
30
+
2
×
30
×
2
+
2
=
900
+
120
+
4
=
1024
(7)
2
81
2
2
2
=
(
80
+
1
)
=
80
+
2
×
80
×
1
+
1
=
6400
+
160
+
1
=
6561
(8)
47
×
53
2
2
=
(
50
−
3
)
(
50
+
3
)
=
50
−
3
=
2500
−
9
=
2491
(9)
89
×
91
2
2
=
(
90
−
1
)
(
90
+
1
)
=
90
−
1
=
8100
−
1
=
8099
(10)
2
33
2
2
2
=
(
30
+
3
)
=
30
+
2
×
30
×
3
+
3
=
900
+
180
+
9
=
1089
(11)
2
51
2
2
2
=
(
50
+
1
)
=
50
+
2
×
50
×
1
+
1
=
2500
+
100
+
1
=
2601
(12)
2
68
2
2
2
=
(
70
−
2
)
=
70
−
2
×
70
×
2
+
2
=
4900
−
280
+
4
=
4624