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