Reken de erafsommen tot 20 uit
Erafsommen
|
1.
4 – 3 =
3
1
|
2.
2 – 2 =
0
5
|
3.
17 – 6 =
11
3
|
4.
13 – 1 =
2
12
|
|
5.
14 – 14 =
0
5
|
6.
10 – 5 =
6
5
|
7.
1 – 0 =
5
1
|
8.
19 – 11 =
8
2
|
|
9.
9 – 5 =
4
9
|
10.
5 – 1 =
4
8
|
11.
17 – 3 =
14
9
|
12.
4 – 1 =
7
3
|
|
13.
8 – 2 =
4
6
|
14.
11 – 9 =
2
7
|
15.
4 – 0 =
7
4
|
16.
9 – 2 =
1
7
|
|
17.
20 – 4 =
16
21
|
18.
7 – 0 =
3
7
|
19.
11 – 10 =
6
1
|
20.
6 – 5 =
6
1
|