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