Rekensommen met eraf tot 20

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

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