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