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