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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
56.8
−
66.8
(2)
2
2
7.6
−
5.6
(3)
2
2
8.66
−
7.66
(4)
2
2
0.38
−
0.68
(5)
2
2
3.6
−
7.6
(6)
2
2
5.68
−
6.68
(7)
2
2
5.7
−
4.7
(8)
2
2
7.4
−
2.4
(9)
2
2
2.2
−
3.2
(10)
2
2
8.62
−
9.62
(11)
2
2
2.5
−
4.5
(12)
2
2
0.29
−
0.49
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
56.8
−
66.8
=
(
56.8
−
66.8
)
(
56.8
+
66.8
)
=
−10
×
123.6
=
−1236
(2)
2
2
7.6
−
5.6
=
(
7.6
−
5.6
)
(
7.6
+
5.6
)
=
2
×
13.2
=
26.4
(3)
2
2
8.66
−
7.66
=
(
8.66
−
7.66
)
(
8.66
+
7.66
)
=
16.32
(4)
2
2
0.38
−
0.68
=
(
0.38
−
0.68
)
(
0.38
+
0.68
)
=
−0.3
×
1.06
=
−0.318
(5)
2
2
3.6
−
7.6
=
(
3.6
−
7.6
)
(
3.6
+
7.6
)
=
−4
×
11.2
=
−44.8
(6)
2
2
5.68
−
6.68
=
(
5.68
−
6.68
)
(
5.68
+
6.68
)
=
−12.36
(7)
2
2
5.7
−
4.7
=
(
5.7
−
4.7
)
(
5.7
+
4.7
)
=
10.4
(8)
2
2
7.4
−
2.4
=
(
7.4
−
2.4
)
(
7.4
+
2.4
)
=
5
×
9.8
=
49
(9)
2
2
2.2
−
3.2
=
(
2.2
−
3.2
)
(
2.2
+
3.2
)
=
−5.4
(10)
2
2
8.62
−
9.62
=
(
8.62
−
9.62
)
(
8.62
+
9.62
)
=
−18.24
(11)
2
2
2.5
−
4.5
=
(
2.5
−
4.5
)
(
2.5
+
4.5
)
=
−2
×
7
=
−14
(12)
2
2
0.29
−
0.49
=
(
0.29
−
0.49
)
(
0.29
+
0.49
)
=
−0.2
×
0.78
=
−0.156