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