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