［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
6.5
−
2.5
(2)
2
2
8.8
−
5.8
(3)
2
2
0.35
−
0.55
(4)
2
2
39.8
−
29.8
(5)
2
2
46.3
−
56.3
(6)
2
2
6.72
−
5.72
(7)
2
2
2.6
−
8.6
(8)
2
2
5.9
−
3.9
(9)
2
2
8.5
−
5.5
(10)
2
2
6.49
−
7.49
(11)
2
2
6.3
−
4.3
(12)
2
2
34.5
−
24.5
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
6.5
−
2.5
=
(
6.5
−
2.5
)
(
6.5
＋
2.5
)
=
4
×
9
=
36
(2)
2
2
8.8
−
5.8
=
(
8.8
−
5.8
)
(
8.8
＋
5.8
)
=
3
×
14.6
=
43.8
(3)
2
2
0.35
−
0.55
=
(
0.35
−
0.55
)
(
0.35
＋
0.55
)
=
−0.2
×
0.9
=
−0.18
(4)
2
2
39.8
−
29.8
=
(
39.8
−
29.8
)
(
39.8
＋
29.8
)
=
10
×
69.6
=
696
(5)
2
2
46.3
−
56.3
=
(
46.3
−
56.3
)
(
46.3
＋
56.3
)
=
−10
×
102.6
=
−1026
(6)
2
2
6.72
−
5.72
=
(
6.72
−
5.72
)
(
6.72
＋
5.72
)
=
12.44
(7)
2
2
2.6
−
8.6
=
(
2.6
−
8.6
)
(
2.6
＋
8.6
)
=
−6
×
11.2
=
−67.2
(8)
2
2
5.9
−
3.9
=
(
5.9
−
3.9
)
(
5.9
＋
3.9
)
=
2
×
9.8
=
19.6
(9)
2
2
8.5
−
5.5
=
(
8.5
−
5.5
)
(
8.5
＋
5.5
)
=
3
×
14
=
42
(10)
2
2
6.49
−
7.49
=
(
6.49
−
7.49
)
(
6.49
＋
7.49
)
=
−13.98
(11)
2
2
6.3
−
4.3
=
(
6.3
−
4.3
)
(
6.3
＋
4.3
)
=
2
×
10.6
=
21.2
(12)
2
2
34.5
−
24.5
=
(
34.5
−
24.5
)
(
34.5
＋
24.5
)
=
10
×
59
=
590