Welk getal uit de tafel van 15 ontbreekt?
Tafels
1.
×
=
15
1
________
2.
×
=
15
4
________
3.
×
=
15
9
________
4.
×
=
15
1
________
5.
×
=
15
5
________
6.
×
=
15
3
________
7.
×
=
15
9
________
8.
×
=
15
7
________
9.
×
=
15
10
________
10.
×
=
15
4
________
11.
×
=
15
9
________
12.
×
=
15
4
________
13.
×
=
15
4
________
14.
×
=
15
2
________
15.
×
=
15
5
________
16.
×
=
15
3
________
17.
×
=
15
4
________
18.
×
=
15
6
________
19.
×
=
15
1
________
20.
×
=
15
1
________
21.
×
=
15
3
________
22.
×
=
15
4
________
23.
×
=
15
3
________
24.
×
=
15
4
________