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