Oefen de erafsommen tot 20

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

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