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