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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
37.5
−
27.5
(2)
2
2
7.8
−
4.8
(3)
2
2
6.9
−
8.9
(4)
2
2
2.8
−
6.8
(5)
2
2
3.37
−
2.37
(6)
2
2
6.82
−
5.82
(7)
2
2
0.74
−
0.54
(8)
2
2
46.3
−
36.3
(9)
2
2
6.3
−
7.3
(10)
2
2
68.8
−
78.8
(11)
2
2
0.79
−
0.49
(12)
2
2
8.5
−
4.5
©2025 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
37.5
−
27.5
=
(
37.5
−
27.5
)
(
37.5
+
27.5
)
=
10
×
65
=
650
(2)
2
2
7.8
−
4.8
=
(
7.8
−
4.8
)
(
7.8
+
4.8
)
=
3
×
12.6
=
37.8
(3)
2
2
6.9
−
8.9
=
(
6.9
−
8.9
)
(
6.9
+
8.9
)
=
−2
×
15.8
=
−31.6
(4)
2
2
2.8
−
6.8
=
(
2.8
−
6.8
)
(
2.8
+
6.8
)
=
−4
×
9.6
=
−38.4
(5)
2
2
3.37
−
2.37
=
(
3.37
−
2.37
)
(
3.37
+
2.37
)
=
5.74
(6)
2
2
6.82
−
5.82
=
(
6.82
−
5.82
)
(
6.82
+
5.82
)
=
12.64
(7)
2
2
0.74
−
0.54
=
(
0.74
−
0.54
)
(
0.74
+
0.54
)
=
0.2
×
1.28
=
0.256
(8)
2
2
46.3
−
36.3
=
(
46.3
−
36.3
)
(
46.3
+
36.3
)
=
10
×
82.6
=
826
(9)
2
2
6.3
−
7.3
=
(
6.3
−
7.3
)
(
6.3
+
7.3
)
=
−13.6
(10)
2
2
68.8
−
78.8
=
(
68.8
−
78.8
)
(
68.8
+
78.8
)
=
−10
×
147.6
=
−1476
(11)
2
2
0.79
−
0.49
=
(
0.79
−
0.49
)
(
0.79
+
0.49
)
=
0.3
×
1.28
=
0.384
(12)
2
2
8.5
−
4.5
=
(
8.5
−
4.5
)
(
8.5
+
4.5
)
=
4
×
13
=
52