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