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