［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
4.7
−
5.7
(2)
2
2
7.4
−
4.4
(3)
2
2
6.58
−
5.58
(4)
2
2
21.9
−
11.9
(5)
2
2
3.6
−
2.6
(6)
2
2
69.1
−
79.1
(7)
2
2
8.6
−
5.6
(8)
2
2
4.36
−
3.36
(9)
2
2
2.1
−
8.1
(10)
2
2
4.3
−
2.3
(11)
2
2
7.73
−
8.73
(12)
2
2
0.67
−
0.87
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
4.7
−
5.7
=
(
4.7
−
5.7
)
(
4.7
＋
5.7
)
=
−10.4
(2)
2
2
7.4
−
4.4
=
(
7.4
−
4.4
)
(
7.4
＋
4.4
)
=
3
×
11.8
=
35.4
(3)
2
2
6.58
−
5.58
=
(
6.58
−
5.58
)
(
6.58
＋
5.58
)
=
12.16
(4)
2
2
21.9
−
11.9
=
(
21.9
−
11.9
)
(
21.9
＋
11.9
)
=
10
×
33.8
=
338
(5)
2
2
3.6
−
2.6
=
(
3.6
−
2.6
)
(
3.6
＋
2.6
)
=
6.2
(6)
2
2
69.1
−
79.1
=
(
69.1
−
79.1
)
(
69.1
＋
79.1
)
=
−10
×
148.2
=
−1482
(7)
2
2
8.6
−
5.6
=
(
8.6
−
5.6
)
(
8.6
＋
5.6
)
=
3
×
14.2
=
42.6
(8)
2
2
4.36
−
3.36
=
(
4.36
−
3.36
)
(
4.36
＋
3.36
)
=
7.72
(9)
2
2
2.1
−
8.1
=
(
2.1
−
8.1
)
(
2.1
＋
8.1
)
=
−6
×
10.2
=
−61.2
(10)
2
2
4.3
−
2.3
=
(
4.3
−
2.3
)
(
4.3
＋
2.3
)
=
2
×
6.6
=
13.2
(11)
2
2
7.73
−
8.73
=
(
7.73
−
8.73
)
(
7.73
＋
8.73
)
=
−16.46
(12)
2
2
0.67
−
0.87
=
(
0.67
−
0.87
)
(
0.67
＋
0.87
)
=
−0.2
×
1.54
=
−0.308