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©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
2
41
(2)
47
×
53
(3)
2
29
(4)
58
×
62
(5)
2
83
(6)
2
28
(7)
63
×
57
(8)
49
×
51
(9)
2
39
(10)
2
68
(11)
2
88
(12)
2
39
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
2
41
2
2
2
=
(
40
+
1
)
=
40
+
2
×
40
×
1
+
1
=
1600
+
80
+
1
=
1681
(2)
47
×
53
2
2
=
(
50
−
3
)
(
50
+
3
)
=
50
−
3
=
2500
−
9
=
2491
(3)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(4)
58
×
62
2
2
=
(
60
−
2
)
(
60
+
2
)
=
60
−
2
=
3600
−
4
=
3596
(5)
2
83
2
2
2
=
(
80
+
3
)
=
80
+
2
×
80
×
3
+
3
=
6400
+
480
+
9
=
6889
(6)
2
28
2
2
2
=
(
30
−
2
)
=
30
−
2
×
30
×
2
+
2
=
900
−
120
+
4
=
784
(7)
63
×
57
2
2
=
(
60
+
3
)
(
60
−
3
)
=
60
−
3
=
3600
−
9
=
3591
(8)
49
×
51
2
2
=
(
50
−
1
)
(
50
+
1
)
=
50
−
1
=
2500
−
1
=
2499
(9)
2
39
2
2
2
=
(
40
−
1
)
=
40
−
2
×
40
×
1
+
1
=
1600
−
80
+
1
=
1521
(10)
2
68
2
2
2
=
(
70
−
2
)
=
70
−
2
×
70
×
2
+
2
=
4900
−
280
+
4
=
4624
(11)
2
88
2
2
2
=
(
90
−
2
)
=
90
−
2
×
90
×
2
+
2
=
8100
−
360
+
4
=
7744
(12)
2
39
2
2
2
=
(
40
−
1
)
=
40
−
2
×
40
×
1
+
1
=
1600
−
80
+
1
=
1521