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