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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
6.4
−
3.4
(2)
2
2
7.7
−
6.7
(3)
2
2
6.8
−
7.8
(4)
2
2
58.3
−
68.3
(5)
2
2
0.49
−
0.79
(6)
2
2
24.8
−
14.8
(7)
2
2
7.7
−
2.7
(8)
2
2
53.2
−
43.2
(9)
2
2
0.27
−
0.87
(10)
2
2
0.62
−
0.42
(11)
2
2
44.2
−
34.2
(12)
2
2
0.26
−
0.56
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
6.4
−
3.4
=
(
6.4
−
3.4
)
(
6.4
+
3.4
)
=
3
×
9.8
=
29.4
(2)
2
2
7.7
−
6.7
=
(
7.7
−
6.7
)
(
7.7
+
6.7
)
=
14.4
(3)
2
2
6.8
−
7.8
=
(
6.8
−
7.8
)
(
6.8
+
7.8
)
=
−14.6
(4)
2
2
58.3
−
68.3
=
(
58.3
−
68.3
)
(
58.3
+
68.3
)
=
−10
×
126.6
=
−1266
(5)
2
2
0.49
−
0.79
=
(
0.49
−
0.79
)
(
0.49
+
0.79
)
=
−0.3
×
1.28
=
−0.384
(6)
2
2
24.8
−
14.8
=
(
24.8
−
14.8
)
(
24.8
+
14.8
)
=
10
×
39.6
=
396
(7)
2
2
7.7
−
2.7
=
(
7.7
−
2.7
)
(
7.7
+
2.7
)
=
5
×
10.4
=
52
(8)
2
2
53.2
−
43.2
=
(
53.2
−
43.2
)
(
53.2
+
43.2
)
=
10
×
96.4
=
964
(9)
2
2
0.27
−
0.87
=
(
0.27
−
0.87
)
(
0.27
+
0.87
)
=
−0.6
×
1.14
=
−0.684
(10)
2
2
0.62
−
0.42
=
(
0.62
−
0.42
)
(
0.62
+
0.42
)
=
0.2
×
1.04
=
0.208
(11)
2
2
44.2
−
34.2
=
(
44.2
−
34.2
)
(
44.2
+
34.2
)
=
10
×
78.4
=
784
(12)
2
2
0.26
−
0.56
=
(
0.26
−
0.56
)
(
0.26
+
0.56
)
=
−0.3
×
0.82
=
−0.246