Snelle erbijsommen en erafsommen tot 50
In de mix
1.
10
5
+
=
2.
25
20
–
=
3.
20
10
+
=
4.
10
5
+
=
5.
25
20
–
=
6.
15
15
+
=
7.
35
15
+
=
8.
30
10
+
=
9.
15
10
+
=
10.
15
35
+
=
11.
20
15
+
=
12.
15
10
+
=
13.
20
10
+
=
14.
15
20
+
=
15.
10
5
+
=
16.
15
30
+
=
17.
25
20
–
=
18.
25
20
–
=
19.
20
15
–
=
20.
30
5
+
=
21.
15
0
+
=
22.
15
0
+
=
23.
15
0
+
=
24.
30
25
–
=