［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
8.8
−
6.8
(2)
2
2
63.5
−
73.5
(3)
2
2
0.38
−
0.88
(4)
2
2
2.9
−
3.9
(5)
2
2
0.59
−
0.39
(6)
2
2
4.61
−
5.61
(7)
2
2
0.45
−
0.55
(8)
2
2
46.9
−
56.9
(9)
2
2
6.7
−
3.7
(10)
2
2
8.2
−
3.2
(11)
2
2
0.75
−
0.85
(12)
2
2
67.4
−
77.4
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
8.8
−
6.8
=
(
8.8
−
6.8
)
(
8.8
＋
6.8
)
=
2
×
15.6
=
31.2
(2)
2
2
63.5
−
73.5
=
(
63.5
−
73.5
)
(
63.5
＋
73.5
)
=
−10
×
137
=
−1370
(3)
2
2
0.38
−
0.88
=
(
0.38
−
0.88
)
(
0.38
＋
0.88
)
=
−0.5
×
1.26
=
−0.63
(4)
2
2
2.9
−
3.9
=
(
2.9
−
3.9
)
(
2.9
＋
3.9
)
=
−6.8
(5)
2
2
0.59
−
0.39
=
(
0.59
−
0.39
)
(
0.59
＋
0.39
)
=
0.2
×
0.98
=
0.196
(6)
2
2
4.61
−
5.61
=
(
4.61
−
5.61
)
(
4.61
＋
5.61
)
=
−10.22
(7)
2
2
0.45
−
0.55
=
(
0.45
−
0.55
)
(
0.45
＋
0.55
)
=
−0.1
(8)
2
2
46.9
−
56.9
=
(
46.9
−
56.9
)
(
46.9
＋
56.9
)
=
−10
×
103.8
=
−1038
(9)
2
2
6.7
−
3.7
=
(
6.7
−
3.7
)
(
6.7
＋
3.7
)
=
3
×
10.4
=
31.2
(10)
2
2
8.2
−
3.2
=
(
8.2
−
3.2
)
(
8.2
＋
3.2
)
=
5
×
11.4
=
57
(11)
2
2
0.75
−
0.85
=
(
0.75
−
0.85
)
(
0.75
＋
0.85
)
=
−0.1
×
1.6
=
−0.16
(12)
2
2
67.4
−
77.4
=
(
67.4
−
77.4
)
(
67.4
＋
77.4
)
=
−10
×
144.8
=
−1448