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