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