［文字サイズの変更］
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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
42.2
−
52.2
(2)
2
2
59.1
−
69.1
(3)
2
2
3.3
−
5.3
(4)
2
2
0.37
−
0.67
(5)
2
2
0.54
−
0.64
(6)
2
2
3.7
−
4.7
(7)
2
2
0.29
−
0.89
(8)
2
2
28.4
−
38.4
(9)
2
2
6.23
−
7.23
(10)
2
2
2.2
−
8.2
(11)
2
2
7.7
−
8.7
(12)
2
2
65.6
−
55.6
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
42.2
−
52.2
=
(
42.2
−
52.2
)
(
42.2
＋
52.2
)
=
−10
×
94.4
=
−944
(2)
2
2
59.1
−
69.1
=
(
59.1
−
69.1
)
(
59.1
＋
69.1
)
=
−10
×
128.2
=
−1282
(3)
2
2
3.3
−
5.3
=
(
3.3
−
5.3
)
(
3.3
＋
5.3
)
=
−2
×
8.6
=
−17.2
(4)
2
2
0.37
−
0.67
=
(
0.37
−
0.67
)
(
0.37
＋
0.67
)
=
−0.3
×
1.04
=
−0.312
(5)
2
2
0.54
−
0.64
=
(
0.54
−
0.64
)
(
0.54
＋
0.64
)
=
−0.1
×
1.18
=
−0.118
(6)
2
2
3.7
−
4.7
=
(
3.7
−
4.7
)
(
3.7
＋
4.7
)
=
−8.4
(7)
2
2
0.29
−
0.89
=
(
0.29
−
0.89
)
(
0.29
＋
0.89
)
=
−0.6
×
1.18
=
−0.708
(8)
2
2
28.4
−
38.4
=
(
28.4
−
38.4
)
(
28.4
＋
38.4
)
=
−10
×
66.8
=
−668
(9)
2
2
6.23
−
7.23
=
(
6.23
−
7.23
)
(
6.23
＋
7.23
)
=
−13.46
(10)
2
2
2.2
−
8.2
=
(
2.2
−
8.2
)
(
2.2
＋
8.2
)
=
−6
×
10.4
=
−62.4
(11)
2
2
7.7
−
8.7
=
(
7.7
−
8.7
)
(
7.7
＋
8.7
)
=
−16.4
(12)
2
2
65.6
−
55.6
=
(
65.6
−
55.6
)
(
65.6
＋
55.6
)
=
10
×
121.2
=
1212