Oefen de erafsommen tot 20

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

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