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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
52.8
−
62.8
(2)
2
2
6.9
−
3.9
(3)
2
2
0.58
−
0.48
(4)
2
2
2.8
−
7.8
(5)
2
2
5.54
−
6.54
(6)
2
2
8.3
−
6.3
(7)
2
2
7.95
−
6.95
(8)
2
2
0.79
−
0.49
(9)
2
2
82.8
−
72.8
(10)
2
2
7.24
−
8.24
(11)
2
2
7.42
−
6.42
(12)
2
2
0.82
−
0.22
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
52.8
−
62.8
=
(
52.8
−
62.8
)
(
52.8
+
62.8
)
=
−10
×
115.6
=
−1156
(2)
2
2
6.9
−
3.9
=
(
6.9
−
3.9
)
(
6.9
+
3.9
)
=
3
×
10.8
=
32.4
(3)
2
2
0.58
−
0.48
=
(
0.58
−
0.48
)
(
0.58
+
0.48
)
=
0.1
×
1.06
=
0.106
(4)
2
2
2.8
−
7.8
=
(
2.8
−
7.8
)
(
2.8
+
7.8
)
=
−5
×
10.6
=
−53
(5)
2
2
5.54
−
6.54
=
(
5.54
−
6.54
)
(
5.54
+
6.54
)
=
−12.08
(6)
2
2
8.3
−
6.3
=
(
8.3
−
6.3
)
(
8.3
+
6.3
)
=
2
×
14.6
=
29.2
(7)
2
2
7.95
−
6.95
=
(
7.95
−
6.95
)
(
7.95
+
6.95
)
=
14.9
(8)
2
2
0.79
−
0.49
=
(
0.79
−
0.49
)
(
0.79
+
0.49
)
=
0.3
×
1.28
=
0.384
(9)
2
2
82.8
−
72.8
=
(
82.8
−
72.8
)
(
82.8
+
72.8
)
=
10
×
155.6
=
1556
(10)
2
2
7.24
−
8.24
=
(
7.24
−
8.24
)
(
7.24
+
8.24
)
=
−15.48
(11)
2
2
7.42
−
6.42
=
(
7.42
−
6.42
)
(
7.42
+
6.42
)
=
13.84
(12)
2
2
0.82
−
0.22
=
(
0.82
−
0.22
)
(
0.82
+
0.22
)
=
0.6
×
1.04
=
0.624