Oefen de erafsommen tot 20
Erafsommen
|
1.
9 – 3 =
5
7
8
6
|
2.
13 – 13 =
1
3
2
0
|
3.
20 – 17 =
6
5
3
8
|
4.
19 – 2 =
17
11
15
10
|
|
5.
19 – 14 =
1
10
5
4
|
6.
20 – 7 =
4
6
13
17
|
7.
18 – 18 =
3
1
0
4
|
8.
10 – 4 =
9
6
10
3
|
|
9.
11 – 6 =
1
2
4
5
|
10.
15 – 10 =
5
7
8
4
|
11.
5 – 5 =
0
2
4
1
|
12.
20 – 14 =
3
9
6
4
|
|
13.
9 – 2 =
4
12
7
8
|
14.
20 – 2 =
13
10
18
16
|
15.
10 – 6 =
5
3
4
6
|
16.
20 – 13 =
9
10
6
7
|
|
17.
17 – 6 =
2
16
11
13
|
18.
15 – 14 =
1
6
4
2
|
19.
1 – 0 =
5
1
2
3
|
20.
1 – 0 =
3
1
6
4
|