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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)
43
×
37
(2)
2
62
(3)
29
×
31
(4)
2
27
(5)
2
29
(6)
51
×
49
(7)
82
×
78
(8)
21
×
19
(9)
2
67
(10)
2
88
(11)
2
29
(12)
2
77
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
43
×
37
2
2
=
(
40
+
3
)
(
40
−
3
)
=
40
−
3
=
1600
−
9
=
1591
(2)
2
62
2
2
2
=
(
60
+
2
)
=
60
+
2
×
60
×
2
+
2
=
3600
+
240
+
4
=
3844
(3)
29
×
31
2
2
=
(
30
−
1
)
(
30
+
1
)
=
30
−
1
=
900
−
1
=
899
(4)
2
27
2
2
2
=
(
30
−
3
)
=
30
−
2
×
30
×
3
+
3
=
900
−
180
+
9
=
729
(5)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(6)
51
×
49
2
2
=
(
50
+
1
)
(
50
−
1
)
=
50
−
1
=
2500
−
1
=
2499
(7)
82
×
78
2
2
=
(
80
+
2
)
(
80
−
2
)
=
80
−
2
=
6400
−
4
=
6396
(8)
21
×
19
2
2
=
(
20
+
1
)
(
20
−
1
)
=
20
−
1
=
400
−
1
=
399
(9)
2
67
2
2
2
=
(
70
−
3
)
=
70
−
2
×
70
×
3
+
3
=
4900
−
420
+
9
=
4489
(10)
2
88
2
2
2
=
(
90
−
2
)
=
90
−
2
×
90
×
2
+
2
=
8100
−
360
+
4
=
7744
(11)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(12)
2
77
2
2
2
=
(
80
−
3
)
=
80
−
2
×
80
×
3
+
3
=
6400
−
480
+
9
=
5929