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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
0.73
−
0.63
(2)
2
2
0.44
−
0.34
(3)
2
2
3.5
−
5.5
(4)
2
2
0.74
−
0.64
(5)
2
2
6.4
−
8.4
(6)
2
2
85.9
−
95.9
(7)
2
2
7.8
−
4.8
(8)
2
2
2.2
−
3.2
(9)
2
2
28.4
−
18.4
(10)
2
2
8.62
−
7.62
(11)
2
2
6.8
−
8.8
(12)
2
2
4.19
−
3.19
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.73
−
0.63
=
(
0.73
−
0.63
)
(
0.73
+
0.63
)
=
0.1
×
1.36
=
0.136
(2)
2
2
0.44
−
0.34
=
(
0.44
−
0.34
)
(
0.44
+
0.34
)
=
0.1
×
0.78
=
0.078
(3)
2
2
3.5
−
5.5
=
(
3.5
−
5.5
)
(
3.5
+
5.5
)
=
−2
×
9
=
−18
(4)
2
2
0.74
−
0.64
=
(
0.74
−
0.64
)
(
0.74
+
0.64
)
=
0.1
×
1.38
=
0.138
(5)
2
2
6.4
−
8.4
=
(
6.4
−
8.4
)
(
6.4
+
8.4
)
=
−2
×
14.8
=
−29.6
(6)
2
2
85.9
−
95.9
=
(
85.9
−
95.9
)
(
85.9
+
95.9
)
=
−10
×
181.8
=
−1818
(7)
2
2
7.8
−
4.8
=
(
7.8
−
4.8
)
(
7.8
+
4.8
)
=
3
×
12.6
=
37.8
(8)
2
2
2.2
−
3.2
=
(
2.2
−
3.2
)
(
2.2
+
3.2
)
=
−5.4
(9)
2
2
28.4
−
18.4
=
(
28.4
−
18.4
)
(
28.4
+
18.4
)
=
10
×
46.8
=
468
(10)
2
2
8.62
−
7.62
=
(
8.62
−
7.62
)
(
8.62
+
7.62
)
=
16.24
(11)
2
2
6.8
−
8.8
=
(
6.8
−
8.8
)
(
6.8
+
8.8
)
=
−2
×
15.6
=
−31.2
(12)
2
2
4.19
−
3.19
=
(
4.19
−
3.19
)
(
4.19
+
3.19
)
=
7.38