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