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