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