［文字サイズの変更］
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
＋
0.9
)
×
(
＋
0.3
)
(2)
(
＋
0.8
)
×
(
＋
0.3
)
(3)
(
＋
0.5
)
×
(
−
0.7
)
(4)
(
＋
0.04
)
÷
(
−
0.4
)
(5)
(
＋
0.03
)
÷
(
＋
0.1
)
(6)
(
−
0.5
)
×
(
−
0.5
)
(7)
(
＋
0.9
)
×
(
＋
1
)
(8)
(
−
0.2
)
÷
(
＋
0.2
)
(9)
(
−
0.18
)
÷
(
−
0.3
)
(10)
(
−
1
)
×
(
＋
0.2
)
(11)
(
＋
0.5
)
×
(
−
0.9
)
(12)
(
＋
0.6
)
×
(
＋
0.2
)
(13)
(
−
0.8
)
×
(
−
0.7
)
(14)
(
＋
0.9
)
×
(
＋
0.1
)
(15)
(
−
0.3
)
÷
(
＋
0.3
)
(16)
(
−
0.56
)
÷
(
＋
0.8
)
(17)
(
−
1
)
×
(
＋
0.7
)
(18)
(
＋
0.3
)
×
(
＋
0.4
)
(19)
(
＋
0.1
)
×
(
＋
0.7
)
(20)
(
−
0.4
)
×
(
−
0.2
)
©2026 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)
(
＋
0.8
)
×
(
＋
0.3
)
=
＋
(
0.8
×
0.3
)
=
＋
0.24
(3)
(
＋
0.5
)
×
(
−
0.7
)
=
−
(
0.5
×
0.7
)
=
−0.35
(4)
(
＋
0.04
)
÷
(
−
0.4
)
=
−
(
0.04
÷
0.4
)
=
−0.1
(5)
(
＋
0.03
)
÷
(
＋
0.1
)
=
＋
(
0.03
÷
0.1
)
=
＋
0.3
(6)
(
−
0.5
)
×
(
−
0.5
)
=
＋
(
0.5
×
0.5
)
=
＋
0.25
(7)
(
＋
0.9
)
×
(
＋
1
)
=
＋
(
0.9
×
1
)
=
＋
0.9
(8)
(
−
0.2
)
÷
(
＋
0.2
)
=
−
(
0.2
÷
0.2
)
=
−1
(9)
(
−
0.18
)
÷
(
−
0.3
)
=
＋
(
0.18
÷
0.3
)
=
＋
0.6
(10)
(
−
1
)
×
(
＋
0.2
)
=
−
(
1
×
0.2
)
=
−0.2
(11)
(
＋
0.5
)
×
(
−
0.9
)
=
−
(
0.5
×
0.9
)
=
−0.45
(12)
(
＋
0.6
)
×
(
＋
0.2
)
=
＋
(
0.6
×
0.2
)
=
＋
0.12
(13)
(
−
0.8
)
×
(
−
0.7
)
=
＋
(
0.8
×
0.7
)
=
＋
0.56
(14)
(
＋
0.9
)
×
(
＋
0.1
)
=
＋
(
0.9
×
0.1
)
=
＋
0.09
(15)
(
−
0.3
)
÷
(
＋
0.3
)
=
−
(
0.3
÷
0.3
)
=
−1
(16)
(
−
0.56
)
÷
(
＋
0.8
)
=
−
(
0.56
÷
0.8
)
=
−0.7
(17)
(
−
1
)
×
(
＋
0.7
)
=
−
(
1
×
0.7
)
=
−0.7
(18)
(
＋
0.3
)
×
(
＋
0.4
)
=
＋
(
0.3
×
0.4
)
=
＋
0.12
(19)
(
＋
0.1
)
×
(
＋
0.7
)
=
＋
(
0.1
×
0.7
)
=
＋
0.07
(20)
(
−
0.4
)
×
(
−
0.2
)
=
＋
(
0.4
×
0.2
)
=
＋
0.08