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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C0-10]
(1)
2
2
47.3
−
57.3
(2)
2
2
0.39
−
0.59
(3)
2
2
4.1
−
5.1
(4)
2
2
2.7
−
8.7
(5)
2
2
0.72
−
0.22
(6)
2
2
66.9
−
76.9
(7)
2
2
6.3
−
5.3
(8)
2
2
0.58
−
0.68
(9)
2
2
25.9
−
35.9
(10)
2
2
5.7
−
4.7
(11)
2
2
8.65
−
7.65
(12)
2
2
3.6
−
7.6
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
47.3
−
57.3
=
(
47.3
−
57.3
)
(
47.3
+
57.3
)
=
−10
×
104.6
=
−1046
(2)
2
2
0.39
−
0.59
=
(
0.39
−
0.59
)
(
0.39
+
0.59
)
=
−0.2
×
0.98
=
−0.196
(3)
2
2
4.1
−
5.1
=
(
4.1
−
5.1
)
(
4.1
+
5.1
)
=
−9.2
(4)
2
2
2.7
−
8.7
=
(
2.7
−
8.7
)
(
2.7
+
8.7
)
=
−6
×
11.4
=
−68.4
(5)
2
2
0.72
−
0.22
=
(
0.72
−
0.22
)
(
0.72
+
0.22
)
=
0.5
×
0.94
=
0.47
(6)
2
2
66.9
−
76.9
=
(
66.9
−
76.9
)
(
66.9
+
76.9
)
=
−10
×
143.8
=
−1438
(7)
2
2
6.3
−
5.3
=
(
6.3
−
5.3
)
(
6.3
+
5.3
)
=
11.6
(8)
2
2
0.58
−
0.68
=
(
0.58
−
0.68
)
(
0.58
+
0.68
)
=
−0.1
×
1.26
=
−0.126
(9)
2
2
25.9
−
35.9
=
(
25.9
−
35.9
)
(
25.9
+
35.9
)
=
−10
×
61.8
=
−618
(10)
2
2
5.7
−
4.7
=
(
5.7
−
4.7
)
(
5.7
+
4.7
)
=
10.4
(11)
2
2
8.65
−
7.65
=
(
8.65
−
7.65
)
(
8.65
+
7.65
)
=
16.3
(12)
2
2
3.6
−
7.6
=
(
3.6
−
7.6
)
(
3.6
+
7.6
)
=
−4
×
11.2
=
−44.8