［文字サイズの変更］
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▲
©2025 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
＋
0.9
)
×
(
−
0.3
)
(2)
(
−
0.3
)
×
(
−
0.3
)
(3)
(
−
0.1
)
÷
(
＋
0.2
)
(4)
(
＋
0.1
)
÷
(
−
0.5
)
(5)
(
＋
0.16
)
÷
(
−
0.8
)
(6)
(
＋
0.27
)
÷
(
＋
0.3
)
(7)
(
＋
0.8
)
×
(
＋
0.6
)
(8)
(
＋
1
)
×
(
−
0.5
)
(9)
(
＋
0.4
)
×
(
−
0.4
)
(10)
(
＋
0.06
)
÷
(
−
0.2
)
(11)
(
−
0.1
)
×
(
＋
0.6
)
(12)
(
＋
0.9
)
×
(
＋
0.2
)
(13)
(
＋
0.42
)
÷
(
＋
0.6
)
(14)
(
＋
0.15
)
÷
(
−
0.3
)
(15)
(
＋
0.48
)
÷
(
＋
0.6
)
(16)
(
＋
0.3
)
×
(
＋
0.4
)
(17)
(
−
0.1
)
×
(
−
0.4
)
(18)
(
＋
0.12
)
÷
(
＋
0.2
)
(19)
(
＋
0.7
)
×
(
−
0.2
)
(20)
(
−
0.5
)
×
(
＋
0.4
)
©2025 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
＋
0.9
)
×
(
−
0.3
)
=
−
(
0.9
×
0.3
)
=
−0.27
(2)
(
−
0.3
)
×
(
−
0.3
)
=
＋
(
0.3
×
0.3
)
=
＋
0.09
(3)
(
−
0.1
)
÷
(
＋
0.2
)
=
−
(
0.1
÷
0.2
)
=
−0.5
(4)
(
＋
0.1
)
÷
(
−
0.5
)
=
−
(
0.1
÷
0.5
)
=
−0.2
(5)
(
＋
0.16
)
÷
(
−
0.8
)
=
−
(
0.16
÷
0.8
)
=
−0.2
(6)
(
＋
0.27
)
÷
(
＋
0.3
)
=
＋
(
0.27
÷
0.3
)
=
＋
0.9
(7)
(
＋
0.8
)
×
(
＋
0.6
)
=
＋
(
0.8
×
0.6
)
=
＋
0.48
(8)
(
＋
1
)
×
(
−
0.5
)
=
−
(
1
×
0.5
)
=
−0.5
(9)
(
＋
0.4
)
×
(
−
0.4
)
=
−
(
0.4
×
0.4
)
=
−0.16
(10)
(
＋
0.06
)
÷
(
−
0.2
)
=
−
(
0.06
÷
0.2
)
=
−0.3
(11)
(
−
0.1
)
×
(
＋
0.6
)
=
−
(
0.1
×
0.6
)
=
−0.06
(12)
(
＋
0.9
)
×
(
＋
0.2
)
=
＋
(
0.9
×
0.2
)
=
＋
0.18
(13)
(
＋
0.42
)
÷
(
＋
0.6
)
=
＋
(
0.42
÷
0.6
)
=
＋
0.7
(14)
(
＋
0.15
)
÷
(
−
0.3
)
=
−
(
0.15
÷
0.3
)
=
−0.5
(15)
(
＋
0.48
)
÷
(
＋
0.6
)
=
＋
(
0.48
÷
0.6
)
=
＋
0.8
(16)
(
＋
0.3
)
×
(
＋
0.4
)
=
＋
(
0.3
×
0.4
)
=
＋
0.12
(17)
(
−
0.1
)
×
(
−
0.4
)
=
＋
(
0.1
×
0.4
)
=
＋
0.04
(18)
(
＋
0.12
)
÷
(
＋
0.2
)
=
＋
(
0.12
÷
0.2
)
=
＋
0.6
(19)
(
＋
0.7
)
×
(
−
0.2
)
=
−
(
0.7
×
0.2
)
=
−0.14
(20)
(
−
0.5
)
×
(
＋
0.4
)
=
−
(
0.5
×
0.4
)
=
−0.2