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