Oefen de erbijsommen tot 50

Erbijsommen
1.
0
+
20
=
2.
15
+
30
=
3.
10
+
30
=
4.
0
+
45
=
5.
5
+
15
=
6.
5
+
20
=
7.
0
+
45
=
8.
10
+
15
=
9.
15
+
30
=
10.
10
+
35
=
11.
10
+
15
=
12.
20
+
30
=
13.
5
+
20
=
14.
5
+
40
=
15.
20
+
30
=
16.
5
+
15
=
17.
20
+
30
=
18.
5
+
40
=
19.
15
+
35
=
20.
5
+
25
=
21.
10
+
20
=
22.
10
+
30
=
23.
10
+
40
=
24.
0
+
30
=
25.
5
+
40
=
26.
5
+
25
=
27.
10
+
30
=
28.
5
+
25
=
29.
10
+
40
=
30.
0
+
45
=
31.
10
+
40
=
32.
5
+
30
=
33.
5
+
5
=
34.
10
+
40
=
35.
20
+
30
=
36.
10
+
10
=
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Oefen de erbijsommen tot 50
| ANTWOORDEN

Erbijsommen
1.
0
+
20
=
20
2.
15
+
30
=
45
3.
10
+
30
=
40
4.
0
+
45
=
45
5.
5
+
15
=
20
6.
5
+
20
=
25
7.
0
+
45
=
45
8.
10
+
15
=
25
9.
15
+
30
=
45
10.
10
+
35
=
45
11.
10
+
15
=
25
12.
20
+
30
=
50
13.
5
+
20
=
25
14.
5
+
40
=
45
15.
20
+
30
=
50
16.
5
+
15
=
20
17.
20
+
30
=
50
18.
5
+
40
=
45
19.
15
+
35
=
50
20.
5
+
25
=
30
21.
10
+
20
=
30
22.
10
+
30
=
40
23.
10
+
40
=
50
24.
0
+
30
=
30
25.
5
+
40
=
45
26.
5
+
25
=
30
27.
10
+
30
=
40
28.
5
+
25
=
30
29.
10
+
40
=
50
30.
0
+
45
=
45
31.
10
+
40
=
50
32.
5
+
30
=
35
33.
5
+
5
=
10
34.
10
+
40
=
50
35.
20
+
30
=
50
36.
10
+
10
=
20
© JuniorEinstein.nl
Online oefenen  |   Educatieve boeken  |   Werkbladen  |   Educatieve materialen