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