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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
26.4
−
36.4
(2)
2
2
3.4
−
7.4
(3)
2
2
0.68
−
0.78
(4)
2
2
5.5
−
7.5
(5)
2
2
0.28
−
0.38
(6)
2
2
39.7
−
49.7
(7)
2
2
0.29
−
0.49
(8)
2
2
0.42
−
0.82
(9)
2
2
7.6
−
2.6
(10)
2
2
3.16
−
2.16
(11)
2
2
58.4
−
48.4
(12)
2
2
0.55
−
0.75
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
26.4
−
36.4
=
(
26.4
−
36.4
)
(
26.4
+
36.4
)
=
−10
×
62.8
=
−628
(2)
2
2
3.4
−
7.4
=
(
3.4
−
7.4
)
(
3.4
+
7.4
)
=
−4
×
10.8
=
−43.2
(3)
2
2
0.68
−
0.78
=
(
0.68
−
0.78
)
(
0.68
+
0.78
)
=
−0.1
×
1.46
=
−0.146
(4)
2
2
5.5
−
7.5
=
(
5.5
−
7.5
)
(
5.5
+
7.5
)
=
−2
×
13
=
−26
(5)
2
2
0.28
−
0.38
=
(
0.28
−
0.38
)
(
0.28
+
0.38
)
=
−0.1
×
0.66
=
−0.066
(6)
2
2
39.7
−
49.7
=
(
39.7
−
49.7
)
(
39.7
+
49.7
)
=
−10
×
89.4
=
−894
(7)
2
2
0.29
−
0.49
=
(
0.29
−
0.49
)
(
0.29
+
0.49
)
=
−0.2
×
0.78
=
−0.156
(8)
2
2
0.42
−
0.82
=
(
0.42
−
0.82
)
(
0.42
+
0.82
)
=
−0.4
×
1.24
=
−0.496
(9)
2
2
7.6
−
2.6
=
(
7.6
−
2.6
)
(
7.6
+
2.6
)
=
5
×
10.2
=
51
(10)
2
2
3.16
−
2.16
=
(
3.16
−
2.16
)
(
3.16
+
2.16
)
=
5.32
(11)
2
2
58.4
−
48.4
=
(
58.4
−
48.4
)
(
58.4
+
48.4
)
=
10
×
106.8
=
1068
(12)
2
2
0.55
−
0.75
=
(
0.55
−
0.75
)
(
0.55
+
0.75
)
=
−0.2
×
1.3
=
−0.26