Reken de erafsommen tot 20 uit
Erafsommen
|
1.
16 – 1 =
10
15
|
2.
20 – 3 =
17
11
|
3.
14 – 10 =
3
4
|
4.
5 – 2 =
1
3
|
|
5.
8 – 8 =
0
3
|
6.
9 – 8 =
5
1
|
7.
4 – 0 =
4
7
|
8.
13 – 13 =
0
4
|
|
9.
16 – 14 =
4
2
|
10.
15 – 9 =
4
6
|
11.
14 – 0 =
14
9
|
12.
15 – 0 =
15
17
|
|
13.
8 – 2 =
6
1
|
14.
6 – 1 =
2
5
|
15.
15 – 1 =
11
14
|
16.
2 – 0 =
2
6
|
|
17.
20 – 18 =
2
1
|
18.
18 – 2 =
21
16
|
19.
13 – 12 =
6
1
|
20.
6 – 5 =
1
6
|