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©2025 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C0-10]
(1)
2
2
87.4
−
77.4
(2)
2
2
24.3
−
34.3
(3)
2
2
52.4
−
42.4
(4)
2
2
77.2
−
87.2
(5)
2
2
4.1
−
5.1
(6)
2
2
0.87
−
0.47
(7)
2
2
4.2
−
5.2
(8)
2
2
6.4
−
5.4
(9)
2
2
42.8
−
52.8
(10)
2
2
0.25
−
0.45
(11)
2
2
4.6
−
6.6
(12)
2
2
4.3
−
3.3
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
87.4
−
77.4
=
(
87.4
−
77.4
)
(
87.4
+
77.4
)
=
10
×
164.8
=
1648
(2)
2
2
24.3
−
34.3
=
(
24.3
−
34.3
)
(
24.3
+
34.3
)
=
−10
×
58.6
=
−586
(3)
2
2
52.4
−
42.4
=
(
52.4
−
42.4
)
(
52.4
+
42.4
)
=
10
×
94.8
=
948
(4)
2
2
77.2
−
87.2
=
(
77.2
−
87.2
)
(
77.2
+
87.2
)
=
−10
×
164.4
=
−1644
(5)
2
2
4.1
−
5.1
=
(
4.1
−
5.1
)
(
4.1
+
5.1
)
=
−9.2
(6)
2
2
0.87
−
0.47
=
(
0.87
−
0.47
)
(
0.87
+
0.47
)
=
0.4
×
1.34
=
0.536
(7)
2
2
4.2
−
5.2
=
(
4.2
−
5.2
)
(
4.2
+
5.2
)
=
−9.4
(8)
2
2
6.4
−
5.4
=
(
6.4
−
5.4
)
(
6.4
+
5.4
)
=
11.8
(9)
2
2
42.8
−
52.8
=
(
42.8
−
52.8
)
(
42.8
+
52.8
)
=
−10
×
95.6
=
−956
(10)
2
2
0.25
−
0.45
=
(
0.25
−
0.45
)
(
0.25
+
0.45
)
=
−0.2
×
0.7
=
−0.14
(11)
2
2
4.6
−
6.6
=
(
4.6
−
6.6
)
(
4.6
+
6.6
)
=
−2
×
11.2
=
−22.4
(12)
2
2
4.3
−
3.3
=
(
4.3
−
3.3
)
(
4.3
+
3.3
)
=
7.6