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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
8.8
−
7.8
(2)
2
2
7.26
−
6.26
(3)
2
2
64.4
−
74.4
(4)
2
2
0.89
−
0.59
(5)
2
2
4.2
−
2.2
(6)
2
2
0.57
−
0.77
(7)
2
2
0.28
−
0.88
(8)
2
2
7.7
−
2.7
(9)
2
2
4.1
−
2.1
(10)
2
2
5.52
−
4.52
(11)
2
2
7.6
−
4.6
(12)
2
2
84.5
−
94.5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
8.8
−
7.8
=
(
8.8
−
7.8
)
(
8.8
+
7.8
)
=
16.6
(2)
2
2
7.26
−
6.26
=
(
7.26
−
6.26
)
(
7.26
+
6.26
)
=
13.52
(3)
2
2
64.4
−
74.4
=
(
64.4
−
74.4
)
(
64.4
+
74.4
)
=
−10
×
138.8
=
−1388
(4)
2
2
0.89
−
0.59
=
(
0.89
−
0.59
)
(
0.89
+
0.59
)
=
0.3
×
1.48
=
0.444
(5)
2
2
4.2
−
2.2
=
(
4.2
−
2.2
)
(
4.2
+
2.2
)
=
2
×
6.4
=
12.8
(6)
2
2
0.57
−
0.77
=
(
0.57
−
0.77
)
(
0.57
+
0.77
)
=
−0.2
×
1.34
=
−0.268
(7)
2
2
0.28
−
0.88
=
(
0.28
−
0.88
)
(
0.28
+
0.88
)
=
−0.6
×
1.16
=
−0.696
(8)
2
2
7.7
−
2.7
=
(
7.7
−
2.7
)
(
7.7
+
2.7
)
=
5
×
10.4
=
52
(9)
2
2
4.1
−
2.1
=
(
4.1
−
2.1
)
(
4.1
+
2.1
)
=
2
×
6.2
=
12.4
(10)
2
2
5.52
−
4.52
=
(
5.52
−
4.52
)
(
5.52
+
4.52
)
=
10.04
(11)
2
2
7.6
−
4.6
=
(
7.6
−
4.6
)
(
7.6
+
4.6
)
=
3
×
12.2
=
36.6
(12)
2
2
84.5
−
94.5
=
(
84.5
−
94.5
)
(
84.5
+
94.5
)
=
−10
×
179
=
−1790