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©2026 数学クラブ http://sugaku.club/
月 日（ ）
● 計算しなさい
[06C-10]
(1)
(
−
1
)
×
(
＋
0.9
)
(2)
(
−
0.8
)
×
(
−
0.4
)
(3)
(
＋
0.14
)
÷
(
＋
0.2
)
(4)
(
＋
1
)
×
(
＋
0.1
)
(5)
(
−
0.49
)
÷
(
＋
0.7
)
(6)
(
−
1
)
×
(
＋
0.2
)
(7)
(
＋
0.4
)
×
(
−
0.2
)
(8)
(
＋
0.09
)
÷
(
＋
0.3
)
(9)
(
−
0.1
)
×
(
−
0.2
)
(10)
(
＋
0.1
)
×
(
＋
0.1
)
(11)
(
＋
1
)
×
(
−
0.6
)
(12)
(
＋
0.1
)
×
(
−
0.9
)
(13)
(
−
0.2
)
÷
(
−
0.4
)
(14)
(
＋
0.3
)
×
(
＋
0.8
)
(15)
(
＋
0.63
)
÷
(
＋
0.7
)
(16)
(
−
0.63
)
÷
(
＋
0.7
)
(17)
(
−
0.7
)
×
(
−
0.7
)
(18)
(
−
0.6
)
×
(
＋
0.7
)
(19)
(
＋
0.7
)
×
(
＋
0.3
)
(20)
(
−
0.5
)
×
(
−
0.1
)
©2026 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
(
−
1
)
×
(
＋
0.9
)
=
−
(
1
×
0.9
)
=
−0.9
(2)
(
−
0.8
)
×
(
−
0.4
)
=
＋
(
0.8
×
0.4
)
=
＋
0.32
(3)
(
＋
0.14
)
÷
(
＋
0.2
)
=
＋
(
0.14
÷
0.2
)
=
＋
0.7
(4)
(
＋
1
)
×
(
＋
0.1
)
=
＋
(
1
×
0.1
)
=
＋
0.1
(5)
(
−
0.49
)
÷
(
＋
0.7
)
=
−
(
0.49
÷
0.7
)
=
−0.7
(6)
(
−
1
)
×
(
＋
0.2
)
=
−
(
1
×
0.2
)
=
−0.2
(7)
(
＋
0.4
)
×
(
−
0.2
)
=
−
(
0.4
×
0.2
)
=
−0.08
(8)
(
＋
0.09
)
÷
(
＋
0.3
)
=
＋
(
0.09
÷
0.3
)
=
＋
0.3
(9)
(
−
0.1
)
×
(
−
0.2
)
=
＋
(
0.1
×
0.2
)
=
＋
0.02
(10)
(
＋
0.1
)
×
(
＋
0.1
)
=
＋
(
0.1
×
0.1
)
=
＋
0.01
(11)
(
＋
1
)
×
(
−
0.6
)
=
−
(
1
×
0.6
)
=
−0.6
(12)
(
＋
0.1
)
×
(
−
0.9
)
=
−
(
0.1
×
0.9
)
=
−0.09
(13)
(
−
0.2
)
÷
(
−
0.4
)
=
＋
(
0.2
÷
0.4
)
=
＋
0.5
(14)
(
＋
0.3
)
×
(
＋
0.8
)
=
＋
(
0.3
×
0.8
)
=
＋
0.24
(15)
(
＋
0.63
)
÷
(
＋
0.7
)
=
＋
(
0.63
÷
0.7
)
=
＋
0.9
(16)
(
−
0.63
)
÷
(
＋
0.7
)
=
−
(
0.63
÷
0.7
)
=
−0.9
(17)
(
−
0.7
)
×
(
−
0.7
)
=
＋
(
0.7
×
0.7
)
=
＋
0.49
(18)
(
−
0.6
)
×
(
＋
0.7
)
=
−
(
0.6
×
0.7
)
=
−0.42
(19)
(
＋
0.7
)
×
(
＋
0.3
)
=
＋
(
0.7
×
0.3
)
=
＋
0.21
(20)
(
−
0.5
)
×
(
−
0.1
)
=
＋
(
0.5
×
0.1
)
=
＋
0.05