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