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