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