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