Reken de erbijsom tot 50 uit
Erbijsommen
1.
10
+
20
=
2.
0
+
30
=
3.
30
+
0
=
4.
40
+
0
=
5.
45
+
0
=
6.
40
+
10
=
7.
25
+
5
=
8.
30
+
15
=
9.
45
+
5
=
10.
20
+
20
=
11.
5
+
35
=
12.
5
+
40
=
13.
15
+
35
=
14.
10
+
20
=
15.
10
+
15
=
16.
5
+
30
=
17.
20
+
10
=
18.
30
+
0
=
19.
20
+
10
=
20.
20
+
15
=
21.
25
+
20
=
22.
5
+
15
=
23.
0
+
20
=
24.
45
+
0
=
25.
25
+
0
=
26.
20
+
30
=
27.
0
+
25
=
28.
5
+
15
=
29.
40
+
10
=
30.
35
+
5
=
31.
0
+
50
=
32.
5
+
40
=
33.
15
+
10
=
34.
0
+
40
=
35.
10
+
30
=
36.
0
+
50
=