［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
72.7
−
82.7
(2)
2
2
5.3
−
8.3
(3)
2
2
7.8
−
3.8
(4)
2
2
7.9
−
8.9
(5)
2
2
8.8
−
2.8
(6)
2
2
27.1
−
17.1
(7)
2
2
5.8
−
8.8
(8)
2
2
52.2
−
62.2
(9)
2
2
4.9
−
2.9
(10)
2
2
8.3
−
2.3
(11)
2
2
0.88
−
0.48
(12)
2
2
0.64
−
0.84
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
72.7
−
82.7
=
(
72.7
−
82.7
)
(
72.7
＋
82.7
)
=
−10
×
155.4
=
−1554
(2)
2
2
5.3
−
8.3
=
(
5.3
−
8.3
)
(
5.3
＋
8.3
)
=
−3
×
13.6
=
−40.8
(3)
2
2
7.8
−
3.8
=
(
7.8
−
3.8
)
(
7.8
＋
3.8
)
=
4
×
11.6
=
46.4
(4)
2
2
7.9
−
8.9
=
(
7.9
−
8.9
)
(
7.9
＋
8.9
)
=
−16.8
(5)
2
2
8.8
−
2.8
=
(
8.8
−
2.8
)
(
8.8
＋
2.8
)
=
6
×
11.6
=
69.6
(6)
2
2
27.1
−
17.1
=
(
27.1
−
17.1
)
(
27.1
＋
17.1
)
=
10
×
44.2
=
442
(7)
2
2
5.8
−
8.8
=
(
5.8
−
8.8
)
(
5.8
＋
8.8
)
=
−3
×
14.6
=
−43.8
(8)
2
2
52.2
−
62.2
=
(
52.2
−
62.2
)
(
52.2
＋
62.2
)
=
−10
×
114.4
=
−1144
(9)
2
2
4.9
−
2.9
=
(
4.9
−
2.9
)
(
4.9
＋
2.9
)
=
2
×
7.8
=
15.6
(10)
2
2
8.3
−
2.3
=
(
8.3
−
2.3
)
(
8.3
＋
2.3
)
=
6
×
10.6
=
63.6
(11)
2
2
0.88
−
0.48
=
(
0.88
−
0.48
)
(
0.88
＋
0.48
)
=
0.4
×
1.36
=
0.544
(12)
2
2
0.64
−
0.84
=
(
0.64
−
0.84
)
(
0.64
＋
0.84
)
=
−0.2
×
1.48
=
−0.296