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