Oefen de erafsommen tot 20

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

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