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