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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
3.2
−
2.2
(2)
2
2
0.25
−
0.85
(3)
2
2
6.1
−
2.1
(4)
2
2
49.3
−
59.3
(5)
2
2
2.8
−
6.8
(6)
2
2
0.82
−
0.32
(7)
2
2
6.77
−
5.77
(8)
2
2
4.98
−
5.98
(9)
2
2
0.68
−
0.38
(10)
2
2
4.44
−
3.44
(11)
2
2
0.63
−
0.33
(12)
2
2
0.21
−
0.31
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
3.2
−
2.2
=
(
3.2
−
2.2
)
(
3.2
+
2.2
)
=
5.4
(2)
2
2
0.25
−
0.85
=
(
0.25
−
0.85
)
(
0.25
+
0.85
)
=
−0.6
×
1.1
=
−0.66
(3)
2
2
6.1
−
2.1
=
(
6.1
−
2.1
)
(
6.1
+
2.1
)
=
4
×
8.2
=
32.8
(4)
2
2
49.3
−
59.3
=
(
49.3
−
59.3
)
(
49.3
+
59.3
)
=
−10
×
108.6
=
−1086
(5)
2
2
2.8
−
6.8
=
(
2.8
−
6.8
)
(
2.8
+
6.8
)
=
−4
×
9.6
=
−38.4
(6)
2
2
0.82
−
0.32
=
(
0.82
−
0.32
)
(
0.82
+
0.32
)
=
0.5
×
1.14
=
0.57
(7)
2
2
6.77
−
5.77
=
(
6.77
−
5.77
)
(
6.77
+
5.77
)
=
12.54
(8)
2
2
4.98
−
5.98
=
(
4.98
−
5.98
)
(
4.98
+
5.98
)
=
−10.96
(9)
2
2
0.68
−
0.38
=
(
0.68
−
0.38
)
(
0.68
+
0.38
)
=
0.3
×
1.06
=
0.318
(10)
2
2
4.44
−
3.44
=
(
4.44
−
3.44
)
(
4.44
+
3.44
)
=
7.88
(11)
2
2
0.63
−
0.33
=
(
0.63
−
0.33
)
(
0.63
+
0.33
)
=
0.3
×
0.96
=
0.288
(12)
2
2
0.21
−
0.31
=
(
0.21
−
0.31
)
(
0.21
+
0.31
)
=
−0.1
×
0.52
=
−0.052