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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
0.44
−
0.84
(2)
2
2
0.83
−
0.53
(3)
2
2
0.36
−
0.56
(4)
2
2
5.99
−
4.99
(5)
2
2
4.35
−
3.35
(6)
2
2
0.81
−
0.21
(7)
2
2
0.69
−
0.39
(8)
2
2
2.1
−
3.1
(9)
2
2
2.45
−
1.45
(10)
2
2
81.3
−
71.3
(11)
2
2
3.4
−
5.4
(12)
2
2
3.5
−
4.5
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
2
0.44
−
0.84
=
(
0.44
−
0.84
)
(
0.44
+
0.84
)
=
−0.4
×
1.28
=
−0.512
(2)
2
2
0.83
−
0.53
=
(
0.83
−
0.53
)
(
0.83
+
0.53
)
=
0.3
×
1.36
=
0.408
(3)
2
2
0.36
−
0.56
=
(
0.36
−
0.56
)
(
0.36
+
0.56
)
=
−0.2
×
0.92
=
−0.184
(4)
2
2
5.99
−
4.99
=
(
5.99
−
4.99
)
(
5.99
+
4.99
)
=
10.98
(5)
2
2
4.35
−
3.35
=
(
4.35
−
3.35
)
(
4.35
+
3.35
)
=
7.7
(6)
2
2
0.81
−
0.21
=
(
0.81
−
0.21
)
(
0.81
+
0.21
)
=
0.6
×
1.02
=
0.612
(7)
2
2
0.69
−
0.39
=
(
0.69
−
0.39
)
(
0.69
+
0.39
)
=
0.3
×
1.08
=
0.324
(8)
2
2
2.1
−
3.1
=
(
2.1
−
3.1
)
(
2.1
+
3.1
)
=
−5.2
(9)
2
2
2.45
−
1.45
=
(
2.45
−
1.45
)
(
2.45
+
1.45
)
=
3.9
(10)
2
2
81.3
−
71.3
=
(
81.3
−
71.3
)
(
81.3
+
71.3
)
=
10
×
152.6
=
1526
(11)
2
2
3.4
−
5.4
=
(
3.4
−
5.4
)
(
3.4
+
5.4
)
=
−2
×
8.8
=
−17.6
(12)
2
2
3.5
−
4.5
=
(
3.5
−
4.5
)
(
3.5
+
4.5
)
=
−8