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