Snelle erbijsommen en erafsommen tot 50
In de mix
1.
15
0
+
=
2.
35
30
–
=
3.
40
25
–
=
4.
20
5
+
=
5.
20
10
+
=
6.
50
45
–
=
7.
45
25
–
=
8.
15
5
+
=
9.
15
15
+
=
10.
30
20
–
=
11.
15
5
+
=
12.
35
25
–
=
13.
35
30
–
=
14.
35
5
+
=
15.
25
20
+
=
16.
45
40
–
=
17.
25
15
–
=
18.
35
15
–
=
19.
40
15
–
=
20.
25
15
+
=
21.
35
15
–
=
22.
35
10
+
=
23.
15
5
+
=
24.
30
20
+
=