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