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