［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
4.5
−
7.5
(2)
2
2
7.9
−
8.9
(3)
2
2
2.3
−
8.3
(4)
2
2
0.82
−
0.52
(5)
2
2
6.3
−
7.3
(6)
2
2
7.1
−
5.1
(7)
2
2
0.37
−
0.27
(8)
2
2
48.5
−
58.5
(9)
2
2
69.3
−
79.3
(10)
2
2
7.34
−
6.34
(11)
2
2
3.14
−
2.14
(12)
2
2
58.8
−
48.8
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
4.5
−
7.5
=
(
4.5
−
7.5
)
(
4.5
＋
7.5
)
=
−3
×
12
=
−36
(2)
2
2
7.9
−
8.9
=
(
7.9
−
8.9
)
(
7.9
＋
8.9
)
=
−16.8
(3)
2
2
2.3
−
8.3
=
(
2.3
−
8.3
)
(
2.3
＋
8.3
)
=
−6
×
10.6
=
−63.6
(4)
2
2
0.82
−
0.52
=
(
0.82
−
0.52
)
(
0.82
＋
0.52
)
=
0.3
×
1.34
=
0.402
(5)
2
2
6.3
−
7.3
=
(
6.3
−
7.3
)
(
6.3
＋
7.3
)
=
−13.6
(6)
2
2
7.1
−
5.1
=
(
7.1
−
5.1
)
(
7.1
＋
5.1
)
=
2
×
12.2
=
24.4
(7)
2
2
0.37
−
0.27
=
(
0.37
−
0.27
)
(
0.37
＋
0.27
)
=
0.1
×
0.64
=
0.064
(8)
2
2
48.5
−
58.5
=
(
48.5
−
58.5
)
(
48.5
＋
58.5
)
=
−10
×
107
=
−1070
(9)
2
2
69.3
−
79.3
=
(
69.3
−
79.3
)
(
69.3
＋
79.3
)
=
−10
×
148.6
=
−1486
(10)
2
2
7.34
−
6.34
=
(
7.34
−
6.34
)
(
7.34
＋
6.34
)
=
13.68
(11)
2
2
3.14
−
2.14
=
(
3.14
−
2.14
)
(
3.14
＋
2.14
)
=
5.28
(12)
2
2
58.8
−
48.8
=
(
58.8
−
48.8
)
(
58.8
＋
48.8
)
=
10
×
107.6
=
1076