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