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