Oefen de erbijsommen tot 50
Erbijsommen
1.
30
+
20
=
40
30
50
45
2.
0
+
45
=
35
40
45
25
3.
0
+
25
=
15
30
25
20
4.
0
+
50
=
45
40
30
50
5.
45
+
5
=
40
50
45
35
6.
45
+
5
=
30
40
50
45
7.
0
+
50
=
30
35
45
50
8.
5
+
35
=
40
25
35
30
9.
40
+
0
=
35
20
30
40
10.
25
+
15
=
30
35
20
40
11.
15
+
25
=
35
30
25
40
12.
0
+
35
=
45
25
40
35
13.
20
+
5
=
15
25
35
20
14.
30
+
20
=
45
30
50
40
15.
5
+
10
=
15
10
20
25
16.
45
+
5
=
45
35
50
30
17.
50
+
0
=
30
40
45
50
18.
35
+
10
=
30
25
35
45
19.
30
+
15
=
40
45
30
25
20.
15
+
30
=
45
25
35
30
21.
15
+
10
=
20
25
30
15
Oefen de erbijsommen tot 50
| ANTWOORDEN
Erbijsommen
1.
30
+
20
=
40
30
50
45
2.
0
+
45
=
35
40
45
25
3.
0
+
25
=
15
30
25
20
4.
0
+
50
=
45
40
30
50
5.
45
+
5
=
40
50
45
35
6.
45
+
5
=
30
40
50
45
7.
0
+
50
=
30
35
45
50
8.
5
+
35
=
40
25
35
30
9.
40
+
0
=
35
20
30
40
10.
25
+
15
=
30
35
20
40
11.
15
+
25
=
35
30
25
40
12.
0
+
35
=
45
25
40
35
13.
20
+
5
=
15
25
35
20
14.
30
+
20
=
45
30
50
40
15.
5
+
10
=
15
10
20
25
16.
45
+
5
=
45
35
50
30
17.
50
+
0
=
30
40
45
50
18.
35
+
10
=
30
25
35
45
19.
30
+
15
=
40
45
30
25
20.
15
+
30
=
45
25
35
30
21.
15
+
10
=
20
25
30
15