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