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