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