Oefen de erafsommen tot 20
Erafsommen
|
1.
20 – 16 =
6
1
5
4
|
2.
13 – 9 =
8
4
3
7
|
3.
1 – 1 =
5
4
0
2
|
4.
13 – 13 =
1
0
3
2
|
|
5.
18 – 1 =
9
17
18
11
|
6.
4 – 2 =
1
5
2
4
|
7.
4 – 2 =
7
2
1
6
|
8.
20 – 1 =
1
19
17
9
|
|
9.
13 – 7 =
9
6
4
5
|
10.
3 – 0 =
2
7
4
3
|
11.
9 – 7 =
3
6
2
7
|
12.
6 – 2 =
3
4
1
7
|
|
13.
7 – 2 =
6
5
3
9
|
14.
17 – 0 =
17
6
22
5
|
15.
13 – 10 =
6
5
7
3
|
16.
10 – 5 =
4
3
1
5
|
|
17.
15 – 4 =
3
13
11
12
|
18.
17 – 15 =
2
6
4
5
|
19.
7 – 2 =
9
6
5
10
|
20.
1 – 1 =
2
1
0
5
|