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