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