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