［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
0.68
−
0.28
(2)
2
2
8.5
−
5.5
(3)
2
2
53.1
−
43.1
(4)
2
2
0.29
−
0.49
(5)
2
2
3.4
−
7.4
(6)
2
2
0.89
−
0.69
(7)
2
2
46.7
−
36.7
(8)
2
2
26.6
−
36.6
(9)
2
2
7.3
−
4.3
(10)
2
2
0.25
−
0.45
(11)
2
2
8.4
−
3.4
(12)
2
2
7.3
−
4.3
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
0.68
−
0.28
=
(
0.68
−
0.28
)
(
0.68
＋
0.28
)
=
0.4
×
0.96
=
0.384
(2)
2
2
8.5
−
5.5
=
(
8.5
−
5.5
)
(
8.5
＋
5.5
)
=
3
×
14
=
42
(3)
2
2
53.1
−
43.1
=
(
53.1
−
43.1
)
(
53.1
＋
43.1
)
=
10
×
96.2
=
962
(4)
2
2
0.29
−
0.49
=
(
0.29
−
0.49
)
(
0.29
＋
0.49
)
=
−0.2
×
0.78
=
−0.156
(5)
2
2
3.4
−
7.4
=
(
3.4
−
7.4
)
(
3.4
＋
7.4
)
=
−4
×
10.8
=
−43.2
(6)
2
2
0.89
−
0.69
=
(
0.89
−
0.69
)
(
0.89
＋
0.69
)
=
0.2
×
1.58
=
0.316
(7)
2
2
46.7
−
36.7
=
(
46.7
−
36.7
)
(
46.7
＋
36.7
)
=
10
×
83.4
=
834
(8)
2
2
26.6
−
36.6
=
(
26.6
−
36.6
)
(
26.6
＋
36.6
)
=
−10
×
63.2
=
−632
(9)
2
2
7.3
−
4.3
=
(
7.3
−
4.3
)
(
7.3
＋
4.3
)
=
3
×
11.6
=
34.8
(10)
2
2
0.25
−
0.45
=
(
0.25
−
0.45
)
(
0.25
＋
0.45
)
=
−0.2
×
0.7
=
−0.14
(11)
2
2
8.4
−
3.4
=
(
8.4
−
3.4
)
(
8.4
＋
3.4
)
=
5
×
11.8
=
59
(12)
2
2
7.3
−
4.3
=
(
7.3
−
4.3
)
(
7.3
＋
4.3
)
=
3
×
11.6
=
34.8