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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
0.69
−
0.79
(2)
2
2
0.42
−
0.82
(3)
2
2
6.83
−
5.83
(4)
2
2
8.56
−
9.56
(5)
2
2
0.55
−
0.85
(6)
2
2
0.86
−
0.66
(7)
2
2
0.36
−
0.76
(8)
2
2
0.22
−
0.32
(9)
2
2
58.8
−
48.8
(10)
2
2
46.6
−
36.6
(11)
2
2
0.46
−
0.86
(12)
2
2
2.3
−
4.3
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.69
−
0.79
=
(
0.69
−
0.79
)
(
0.69
+
0.79
)
=
−0.1
×
1.48
=
−0.148
(2)
2
2
0.42
−
0.82
=
(
0.42
−
0.82
)
(
0.42
+
0.82
)
=
−0.4
×
1.24
=
−0.496
(3)
2
2
6.83
−
5.83
=
(
6.83
−
5.83
)
(
6.83
+
5.83
)
=
12.66
(4)
2
2
8.56
−
9.56
=
(
8.56
−
9.56
)
(
8.56
+
9.56
)
=
−18.12
(5)
2
2
0.55
−
0.85
=
(
0.55
−
0.85
)
(
0.55
+
0.85
)
=
−0.3
×
1.4
=
−0.42
(6)
2
2
0.86
−
0.66
=
(
0.86
−
0.66
)
(
0.86
+
0.66
)
=
0.2
×
1.52
=
0.304
(7)
2
2
0.36
−
0.76
=
(
0.36
−
0.76
)
(
0.36
+
0.76
)
=
−0.4
×
1.12
=
−0.448
(8)
2
2
0.22
−
0.32
=
(
0.22
−
0.32
)
(
0.22
+
0.32
)
=
−0.1
×
0.54
=
−0.054
(9)
2
2
58.8
−
48.8
=
(
58.8
−
48.8
)
(
58.8
+
48.8
)
=
10
×
107.6
=
1076
(10)
2
2
46.6
−
36.6
=
(
46.6
−
36.6
)
(
46.6
+
36.6
)
=
10
×
83.2
=
832
(11)
2
2
0.46
−
0.86
=
(
0.46
−
0.86
)
(
0.46
+
0.86
)
=
−0.4
×
1.32
=
−0.528
(12)
2
2
2.3
−
4.3
=
(
2.3
−
4.3
)
(
2.3
+
4.3
)
=
−2
×
6.6
=
−13.2