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