［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
5.87
−
6.87
(2)
2
2
0.62
−
0.72
(3)
2
2
27.1
−
37.1
(4)
2
2
0.67
−
0.37
(5)
2
2
55.9
−
45.9
(6)
2
2
7.2
−
8.2
(7)
2
2
7.5
−
3.5
(8)
2
2
0.77
−
0.37
(9)
2
2
31.7
−
21.7
(10)
2
2
3.4
−
2.4
(11)
2
2
0.55
−
0.85
(12)
2
2
0.59
−
0.29
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
5.87
−
6.87
=
(
5.87
−
6.87
)
(
5.87
＋
6.87
)
=
−12.74
(2)
2
2
0.62
−
0.72
=
(
0.62
−
0.72
)
(
0.62
＋
0.72
)
=
−0.1
×
1.34
=
−0.134
(3)
2
2
27.1
−
37.1
=
(
27.1
−
37.1
)
(
27.1
＋
37.1
)
=
−10
×
64.2
=
−642
(4)
2
2
0.67
−
0.37
=
(
0.67
−
0.37
)
(
0.67
＋
0.37
)
=
0.3
×
1.04
=
0.312
(5)
2
2
55.9
−
45.9
=
(
55.9
−
45.9
)
(
55.9
＋
45.9
)
=
10
×
101.8
=
1018
(6)
2
2
7.2
−
8.2
=
(
7.2
−
8.2
)
(
7.2
＋
8.2
)
=
−15.4
(7)
2
2
7.5
−
3.5
=
(
7.5
−
3.5
)
(
7.5
＋
3.5
)
=
4
×
11
=
44
(8)
2
2
0.77
−
0.37
=
(
0.77
−
0.37
)
(
0.77
＋
0.37
)
=
0.4
×
1.14
=
0.456
(9)
2
2
31.7
−
21.7
=
(
31.7
−
21.7
)
(
31.7
＋
21.7
)
=
10
×
53.4
=
534
(10)
2
2
3.4
−
2.4
=
(
3.4
−
2.4
)
(
3.4
＋
2.4
)
=
5.8
(11)
2
2
0.55
−
0.85
=
(
0.55
−
0.85
)
(
0.55
＋
0.85
)
=
−0.3
×
1.4
=
−0.42
(12)
2
2
0.59
−
0.29
=
(
0.59
−
0.29
)
(
0.59
＋
0.29
)
=
0.3
×
0.88
=
0.264