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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)
73
×
67
(2)
2
29
(3)
91
×
89
(4)
18
×
22
(5)
18
×
22
(6)
59
×
61
(7)
2
87
(8)
2
62
(9)
69
×
71
(10)
2
89
(11)
2
37
(12)
2
22
©2026 数学クラブ http://sugaku.club/
月 日( )
【解答例】
(1)
73
×
67
2
2
=
(
70
+
3
)
(
70
−
3
)
=
70
−
3
=
4900
−
9
=
4891
(2)
2
29
2
2
2
=
(
30
−
1
)
=
30
−
2
×
30
×
1
+
1
=
900
−
60
+
1
=
841
(3)
91
×
89
2
2
=
(
90
+
1
)
(
90
−
1
)
=
90
−
1
=
8100
−
1
=
8099
(4)
18
×
22
2
2
=
(
20
−
2
)
(
20
+
2
)
=
20
−
2
=
400
−
4
=
396
(5)
18
×
22
2
2
=
(
20
−
2
)
(
20
+
2
)
=
20
−
2
=
400
−
4
=
396
(6)
59
×
61
2
2
=
(
60
−
1
)
(
60
+
1
)
=
60
−
1
=
3600
−
1
=
3599
(7)
2
87
2
2
2
=
(
90
−
3
)
=
90
−
2
×
90
×
3
+
3
=
8100
−
540
+
9
=
7569
(8)
2
62
2
2
2
=
(
60
+
2
)
=
60
+
2
×
60
×
2
+
2
=
3600
+
240
+
4
=
3844
(9)
69
×
71
2
2
=
(
70
−
1
)
(
70
+
1
)
=
70
−
1
=
4900
−
1
=
4899
(10)
2
89
2
2
2
=
(
90
−
1
)
=
90
−
2
×
90
×
1
+
1
=
8100
−
180
+
1
=
7921
(11)
2
37
2
2
2
=
(
40
−
3
)
=
40
−
2
×
40
×
3
+
3
=
1600
−
240
+
9
=
1369
(12)
2
22
2
2
2
=
(
20
+
2
)
=
20
+
2
×
20
×
2
+
2
=
400
+
80
+
4
=
484