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