Oefen erbijsommen en erafsommen tot 20
In de mix
1.
13
10
jimmy
–
=
2.
15
6
jimmy
–
=
3.
14
9
jimmy
–
=
4.
20
2
jimmy
–
=
5.
3
4
jimmy
+
=
6.
9
5
jimmy
–
=
7.
8
7
jimmy
+
=
8.
6
5
jimmy
–
=
9.
8
6
jimmy
–
=
10.
12
9
jimmy
–
=
11.
6
4
jimmy
+
=
12.
11
5
jimmy
–
=
13.
17
11
jimmy
–
=
14.
14
3
jimmy
–
=
15.
6
10
jimmy
+
=
16.
3
2
jimmy
–
=
17.
13
7
jimmy
+
=
18.
11
10
jimmy
–
=
19.
3
11
jimmy
+
=
20.
14
6
jimmy
+
=
21.
13
12
jimmy
–
=
22.
20
11
jimmy
–
=
23.
4
3
jimmy
–
=
24.
2
18
jimmy
+
=
Oefen erbijsommen en erafsommen tot 20
| ANTWOORDEN
In de mix
1.
13
10
3
–
=
2.
15
6
9
–
=
3.
14
9
5
–
=
4.
20
2
18
–
=
5.
3
4
7
+
=
6.
9
5
4
–
=
7.
8
7
15
+
=
8.
6
5
1
–
=
9.
8
6
2
–
=
10.
12
9
3
–
=
11.
6
4
10
+
=
12.
11
5
6
–
=
13.
17
11
6
–
=
14.
14
3
11
–
=
15.
6
10
16
+
=
16.
3
2
1
–
=
17.
13
7
20
+
=
18.
11
10
1
–
=
19.
3
11
14
+
=
20.
14
6
20
+
=
21.
13
12
1
–
=
22.
20
11
9
–
=
23.
4
3
1
–
=
24.
2
18
20
+
=