Oefen de erafsommen tot 20

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

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