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