[文字サイズの変更]
▼
▲
©2026 数学クラブ http://sugaku.club/
月 日( )
● 次の計算をしなさい
[1C1-00]
(1)
57
×
63
(2)
83
×
77
(3)
2
77
(4)
59
×
61
(5)
91
×
89
(6)
92
×
88
(7)
2
58
(8)
18
×
22
(9)
68
×
72
(10)
57
×
63
(11)
77
×
83
(12)
62
×
58
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
57
×
63
2
2
=
(
60
−
3
)
(
60
+
3
)
=
60
−
3
=
3600
−
9
=
3591
(2)
83
×
77
2
2
=
(
80
+
3
)
(
80
−
3
)
=
80
−
3
=
6400
−
9
=
6391
(3)
2
77
2
2
2
=
(
80
−
3
)
=
80
−
2
×
80
×
3
+
3
=
6400
−
480
+
9
=
5929
(4)
59
×
61
2
2
=
(
60
−
1
)
(
60
+
1
)
=
60
−
1
=
3600
−
1
=
3599
(5)
91
×
89
2
2
=
(
90
+
1
)
(
90
−
1
)
=
90
−
1
=
8100
−
1
=
8099
(6)
92
×
88
2
2
=
(
90
+
2
)
(
90
−
2
)
=
90
−
2
=
8100
−
4
=
8096
(7)
2
58
2
2
2
=
(
60
−
2
)
=
60
−
2
×
60
×
2
+
2
=
3600
−
240
+
4
=
3364
(8)
18
×
22
2
2
=
(
20
−
2
)
(
20
+
2
)
=
20
−
2
=
400
−
4
=
396
(9)
68
×
72
2
2
=
(
70
−
2
)
(
70
+
2
)
=
70
−
2
=
4900
−
4
=
4896
(10)
57
×
63
2
2
=
(
60
−
3
)
(
60
+
3
)
=
60
−
3
=
3600
−
9
=
3591
(11)
77
×
83
2
2
=
(
80
−
3
)
(
80
+
3
)
=
80
−
3
=
6400
−
9
=
6391
(12)
62
×
58
2
2
=
(
60
+
2
)
(
60
−
2
)
=
60
−
2
=
3600
−
4
=
3596