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