Snelle erbijsommen en erafsommen tot 50
In de mix
1.
15
5
+
=
2.
50
40
–
=
3.
30
25
–
=
4.
35
15
–
=
5.
40
25
–
=
6.
20
10
+
=
7.
15
10
+
=
8.
30
25
–
=
9.
25
10
+
=
10.
20
15
–
=
11.
50
20
–
=
12.
20
15
–
=
13.
20
5
+
=
14.
20
5
+
=
15.
15
5
+
=
16.
30
15
+
=
17.
10
5
+
=
18.
50
40
–
=
19.
15
10
+
=
20.
20
5
+
=
21.
15
10
+
=
22.
15
20
+
=
23.
30
20
–
=
24.
50
45
–
=