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