［文字サイズの変更］
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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
＋
0.6
)
×
(
＋
0.3
)
(2)
(
＋
0.09
)
÷
(
＋
0.3
)
(3)
(
＋
0.81
)
÷
(
＋
0.9
)
(4)
(
−
0.81
)
÷
(
−
0.9
)
(5)
(
＋
0.04
)
÷
(
−
0.4
)
(6)
(
−
0.21
)
÷
(
＋
0.3
)
(7)
(
＋
0.6
)
×
(
＋
0.3
)
(8)
(
＋
0.81
)
÷
(
＋
0.9
)
(9)
(
＋
1
)
×
(
＋
0.8
)
(10)
(
＋
0.3
)
×
(
−
0.7
)
(11)
(
＋
0.7
)
×
(
＋
0.5
)
(12)
(
＋
0.6
)
×
(
−
0.6
)
(13)
(
＋
0.4
)
÷
(
−
1
)
(14)
(
−
0.2
)
×
(
＋
0.4
)
(15)
(
＋
0.9
)
×
(
＋
0.8
)
(16)
(
＋
0.6
)
×
(
＋
0.7
)
(17)
(
−
0.9
)
×
(
−
0.5
)
(18)
(
＋
0.5
)
×
(
−
1
)
(19)
(
−
0.4
)
÷
(
＋
0.5
)
(20)
(
−
0.64
)
÷
(
−
0.8
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
＋
0.6
)
×
(
＋
0.3
)
=
＋
(
0.6
×
0.3
)
=
＋
0.18
(2)
(
＋
0.09
)
÷
(
＋
0.3
)
=
＋
(
0.09
÷
0.3
)
=
＋
0.3
(3)
(
＋
0.81
)
÷
(
＋
0.9
)
=
＋
(
0.81
÷
0.9
)
=
＋
0.9
(4)
(
−
0.81
)
÷
(
−
0.9
)
=
＋
(
0.81
÷
0.9
)
=
＋
0.9
(5)
(
＋
0.04
)
÷
(
−
0.4
)
=
−
(
0.04
÷
0.4
)
=
−0.1
(6)
(
−
0.21
)
÷
(
＋
0.3
)
=
−
(
0.21
÷
0.3
)
=
−0.7
(7)
(
＋
0.6
)
×
(
＋
0.3
)
=
＋
(
0.6
×
0.3
)
=
＋
0.18
(8)
(
＋
0.81
)
÷
(
＋
0.9
)
=
＋
(
0.81
÷
0.9
)
=
＋
0.9
(9)
(
＋
1
)
×
(
＋
0.8
)
=
＋
(
1
×
0.8
)
=
＋
0.8
(10)
(
＋
0.3
)
×
(
−
0.7
)
=
−
(
0.3
×
0.7
)
=
−0.21
(11)
(
＋
0.7
)
×
(
＋
0.5
)
=
＋
(
0.7
×
0.5
)
=
＋
0.35
(12)
(
＋
0.6
)
×
(
−
0.6
)
=
−
(
0.6
×
0.6
)
=
−0.36
(13)
(
＋
0.4
)
÷
(
−
1
)
=
−
(
0.4
÷
1
)
=
−0.4
(14)
(
−
0.2
)
×
(
＋
0.4
)
=
−
(
0.2
×
0.4
)
=
−0.08
(15)
(
＋
0.9
)
×
(
＋
0.8
)
=
＋
(
0.9
×
0.8
)
=
＋
0.72
(16)
(
＋
0.6
)
×
(
＋
0.7
)
=
＋
(
0.6
×
0.7
)
=
＋
0.42
(17)
(
−
0.9
)
×
(
−
0.5
)
=
＋
(
0.9
×
0.5
)
=
＋
0.45
(18)
(
＋
0.5
)
×
(
−
1
)
=
−
(
0.5
×
1
)
=
−0.5
(19)
(
−
0.4
)
÷
(
＋
0.5
)
=
−
(
0.4
÷
0.5
)
=
−0.8
(20)
(
−
0.64
)
÷
(
−
0.8
)
=
＋
(
0.64
÷
0.8
)
=
＋
0.8