Rekensommen met erbij en eraf tot 100
In de mix
1.
20
10
+
=
2.
30
70
+
=
3.
30
20
–
=
4.
70
40
–
=
5.
30
30
+
=
6.
40
30
+
=
7.
80
50
–
=
8.
90
20
–
=
9.
20
0
+
=
10.
40
30
–
=
11.
40
20
–
=
12.
10
10
+
=
13.
30
20
+
=
14.
60
40
–
=
15.
80
70
–
=
16.
100
30
–
=
17.
20
10
+
=
18.
20
30
+
=
19.
20
10
+
=
20.
80
40
–
=
21.
20
30
+
=
22.
70
50
–
=
23.
40
20
+
=
24.
70
30
–
=