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©2019 数学クラブ http://sugaku.club/
月 日（ ）
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[1P1-00]
(1)
5
11
(2)
7
3
(3)
17
19
(4)
23
13
(5)
2
17
(6)
5
17
(7)
7
7
(8)
17
7
(9)
19
11
(10)
11
5
(11)
17
2
(12)
19
2
(13)
13
23
(14)
13
17
©2019 数学クラブ http://sugaku.club/
月 日（ ）
【解答例】
(1)
5
11
5
11
×
55
=
=
11
11
×
11
(2)
7
3
7
3
×
21
=
=
3
3
×
3
(3)
17
19
17
19
×
323
=
=
19
19
×
19
(4)
23
13
23
13
×
299
=
=
13
13
×
13
(5)
2
17
2
17
×
34
=
=
17
17
×
17
(6)
5
17
5
17
×
85
=
=
17
17
×
17
(7)
7
7
=
1
(8)
17
7
17
7
×
119
=
=
7
7
×
7
(9)
19
11
19
11
×
209
=
=
11
11
×
11
(10)
11
5
11
5
×
55
=
=
5
5
×
5
(11)
17
2
17
2
×
34
=
=
2
2
×
2
(12)
19
2
19
2
×
38
=
=
2
2
×
2
(13)
13
23
13
23
×
299
=
=
23
23
×
23
(14)
13
17
13
17
×
221
=
=
17
17
×
17