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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
47
(2)
28
×
32
(3)
68
×
72
(4)
23
×
17
(5)
89
×
91
(6)
2
38
(7)
2
57
(8)
63
×
57
(9)
2
29
(10)
83
×
77
(11)
79
×
81
(12)
51
×
49
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
47
2
2
2
=
(
50
−
3
)
=
50
−
2
×
50
×
3
+
3
=
2500
−
300
+
9
=
2209
(2)
28
×
32
2
2
=
(
30
−
2
)
(
30
+
2
)
=
30
−
2
=
900
−
4
=
896
(3)
68
×
72
2
2
=
(
70
−
2
)
(
70
+
2
)
=
70
−
2
=
4900
−
4
=
4896
(4)
23
×
17
2
2
=
(
20
+
3
)
(
20
−
3
)
=
20
−
3
=
400
−
9
=
391
(5)
89
×
91
2
2
=
(
90
−
1
)
(
90
+
1
)
=
90
−
1
=
8100
−
1
=
8099
(6)
2
38
2
2
2
=
(
40
−
2
)
=
40
−
2
×
40
×
2
+
2
=
1600
−
160
+
4
=
1444
(7)
2
57
2
2
2
=
(
60
−
3
)
=
60
−
2
×
60
×
3
+
3
=
3600
−
360
+
9
=
3249
(8)
63
×
57
2
2
=
(
60
+
3
)
(
60
−
3
)
=
60
−
3
=
3600
−
9
=
3591
(9)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(10)
83
×
77
2
2
=
(
80
+
3
)
(
80
−
3
)
=
80
−
3
=
6400
−
9
=
6391
(11)
79
×
81
2
2
=
(
80
−
1
)
(
80
+
1
)
=
80
−
1
=
6400
−
1
=
6399
(12)
51
×
49
2
2
=
(
50
+
1
)
(
50
−
1
)
=
50
−
1
=
2500
−
1
=
2499