Reken de erafsommen tot 20 uit
Erafsommen
|
1.
18 – 5 =
13
11
|
2.
1 – 1 =
0
2
|
3.
13 – 2 =
1
11
|
4.
1 – 1 =
1
0
|
|
5.
1 – 1 =
0
1
|
6.
19 – 17 =
3
2
|
7.
12 – 6 =
9
6
|
8.
8 – 4 =
4
9
|
|
9.
16 – 0 =
9
16
|
10.
14 – 12 =
2
6
|
11.
20 – 0 =
20
25
|
12.
5 – 1 =
8
4
|
|
13.
5 – 0 =
5
6
|
14.
15 – 10 =
5
8
|
15.
7 – 2 =
7
5
|
16.
6 – 2 =
4
8
|
|
17.
3 – 3 =
4
0
|
18.
11 – 7 =
1
4
|
19.
4 – 0 =
4
8
|
20.
14 – 4 =
10
11
|