Oefen de erafsommen tot 50

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

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