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