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