Oefen de erafsommen tot 20

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

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