Oefen de erbijsommen tot 50

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

Oefen de erbijsommen tot 50
| ANTWOORDEN

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