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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)
37
×
43
(2)
2
53
(3)
23
×
17
(4)
2
63
(5)
2
43
(6)
37
×
43
(7)
83
×
77
(8)
2
79
(9)
2
59
(10)
43
×
37
(11)
2
78
(12)
22
×
18
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
37
×
43
2
2
=
(
40
−
3
)
(
40
+
3
)
=
40
−
3
=
1600
−
9
=
1591
(2)
2
53
2
2
2
=
(
50
+
3
)
=
50
+
2
×
50
×
3
+
3
=
2500
+
300
+
9
=
2809
(3)
23
×
17
2
2
=
(
20
+
3
)
(
20
−
3
)
=
20
−
3
=
400
−
9
=
391
(4)
2
63
2
2
2
=
(
60
+
3
)
=
60
+
2
×
60
×
3
+
3
=
3600
+
360
+
9
=
3969
(5)
2
43
2
2
2
=
(
40
+
3
)
=
40
+
2
×
40
×
3
+
3
=
1600
+
240
+
9
=
1849
(6)
37
×
43
2
2
=
(
40
−
3
)
(
40
+
3
)
=
40
−
3
=
1600
−
9
=
1591
(7)
83
×
77
2
2
=
(
80
+
3
)
(
80
−
3
)
=
80
−
3
=
6400
−
9
=
6391
(8)
2
79
2
2
2
=
(
80
−
1
)
=
80
−
2
×
80
×
1
+
1
=
6400
−
160
+
1
=
6241
(9)
2
59
2
2
2
=
(
60
−
1
)
=
60
−
2
×
60
×
1
+
1
=
3600
−
120
+
1
=
3481
(10)
43
×
37
2
2
=
(
40
+
3
)
(
40
−
3
)
=
40
−
3
=
1600
−
9
=
1591
(11)
2
78
2
2
2
=
(
80
−
2
)
=
80
−
2
×
80
×
2
+
2
=
6400
−
320
+
4
=
6084
(12)
22
×
18
2
2
=
(
20
+
2
)
(
20
−
2
)
=
20
−
2
=
400
−
4
=
396