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