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