［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
0.71
−
0.81
(2)
2
2
7.1
−
8.1
(3)
2
2
0.36
−
0.76
(4)
2
2
24.2
−
34.2
(5)
2
2
0.71
−
0.61
(6)
2
2
6.1
−
8.1
(7)
2
2
6.1
−
3.1
(8)
2
2
2.8
−
4.8
(9)
2
2
6.96
−
7.96
(10)
2
2
67.5
−
57.5
(11)
2
2
0.46
−
0.66
(12)
2
2
0.89
−
0.59
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
2
2
0.71
−
0.81
=
(
0.71
−
0.81
)
(
0.71
＋
0.81
)
=
−0.1
×
1.52
=
−0.152
(2)
2
2
7.1
−
8.1
=
(
7.1
−
8.1
)
(
7.1
＋
8.1
)
=
−15.2
(3)
2
2
0.36
−
0.76
=
(
0.36
−
0.76
)
(
0.36
＋
0.76
)
=
−0.4
×
1.12
=
−0.448
(4)
2
2
24.2
−
34.2
=
(
24.2
−
34.2
)
(
24.2
＋
34.2
)
=
−10
×
58.4
=
−584
(5)
2
2
0.71
−
0.61
=
(
0.71
−
0.61
)
(
0.71
＋
0.61
)
=
0.1
×
1.32
=
0.132
(6)
2
2
6.1
−
8.1
=
(
6.1
−
8.1
)
(
6.1
＋
8.1
)
=
−2
×
14.2
=
−28.4
(7)
2
2
6.1
−
3.1
=
(
6.1
−
3.1
)
(
6.1
＋
3.1
)
=
3
×
9.2
=
27.6
(8)
2
2
2.8
−
4.8
=
(
2.8
−
4.8
)
(
2.8
＋
4.8
)
=
−2
×
7.6
=
−15.2
(9)
2
2
6.96
−
7.96
=
(
6.96
−
7.96
)
(
6.96
＋
7.96
)
=
−14.92
(10)
2
2
67.5
−
57.5
=
(
67.5
−
57.5
)
(
67.5
＋
57.5
)
=
10
×
125
=
1250
(11)
2
2
0.46
−
0.66
=
(
0.46
−
0.66
)
(
0.46
＋
0.66
)
=
−0.2
×
1.12
=
−0.224
(12)
2
2
0.89
−
0.59
=
(
0.89
−
0.59
)
(
0.89
＋
0.59
)
=
0.3
×
1.48
=
0.444