Oefen de erafsommen tot 20

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

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