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