［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
7.6
−
5.6
(2)
2
2
53.5
−
43.5
(3)
2
2
0.74
−
0.84
(4)
2
2
0.85
−
0.65
(5)
2
2
8.85
−
9.85
(6)
2
2
43.9
−
33.9
(7)
2
2
6.3
−
5.3
(8)
2
2
8.5
−
6.5
(9)
2
2
2.1
−
3.1
(10)
2
2
7.8
−
8.8
(11)
2
2
2.4
−
8.4
(12)
2
2
0.33
−
0.53
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
7.6
−
5.6
=
(
7.6
−
5.6
)
(
7.6
＋
5.6
)
=
2
×
13.2
=
26.4
(2)
2
2
53.5
−
43.5
=
(
53.5
−
43.5
)
(
53.5
＋
43.5
)
=
10
×
97
=
970
(3)
2
2
0.74
−
0.84
=
(
0.74
−
0.84
)
(
0.74
＋
0.84
)
=
−0.1
×
1.58
=
−0.158
(4)
2
2
0.85
−
0.65
=
(
0.85
−
0.65
)
(
0.85
＋
0.65
)
=
0.2
×
1.5
=
0.3
(5)
2
2
8.85
−
9.85
=
(
8.85
−
9.85
)
(
8.85
＋
9.85
)
=
−18.7
(6)
2
2
43.9
−
33.9
=
(
43.9
−
33.9
)
(
43.9
＋
33.9
)
=
10
×
77.8
=
778
(7)
2
2
6.3
−
5.3
=
(
6.3
−
5.3
)
(
6.3
＋
5.3
)
=
11.6
(8)
2
2
8.5
−
6.5
=
(
8.5
−
6.5
)
(
8.5
＋
6.5
)
=
2
×
15
=
30
(9)
2
2
2.1
−
3.1
=
(
2.1
−
3.1
)
(
2.1
＋
3.1
)
=
−5.2
(10)
2
2
7.8
−
8.8
=
(
7.8
−
8.8
)
(
7.8
＋
8.8
)
=
−16.6
(11)
2
2
2.4
−
8.4
=
(
2.4
−
8.4
)
(
2.4
＋
8.4
)
=
−6
×
10.8
=
−64.8
(12)
2
2
0.33
−
0.53
=
(
0.33
−
0.53
)
(
0.33
＋
0.53
)
=
−0.2
×
0.86
=
−0.172