Rekensommen met erbij en eraf tot 100
In de mix
1.
50
20
–
=
2.
30
10
+
=
3.
80
20
–
=
4.
30
10
+
=
5.
40
30
–
=
6.
80
70
–
=
7.
70
40
–
=
8.
50
10
+
=
9.
90
60
–
=
10.
40
20
+
=
11.
50
40
–
=
12.
80
30
–
=
13.
30
20
–
=
14.
50
20
+
=
15.
80
30
–
=
16.
70
30
–
=
17.
70
50
–
=
18.
30
10
+
=
19.
20
20
+
=
20.
40
20
–
=
21.
90
10
+
=
22.
40
40
+
=
23.
30
20
–
=
24.
90
50
–
=