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