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