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