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