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